WO2018030531A1 - HbA1cの測定法 - Google Patents
HbA1cの測定法 Download PDFInfo
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- WO2018030531A1 WO2018030531A1 PCT/JP2017/029185 JP2017029185W WO2018030531A1 WO 2018030531 A1 WO2018030531 A1 WO 2018030531A1 JP 2017029185 W JP2017029185 W JP 2017029185W WO 2018030531 A1 WO2018030531 A1 WO 2018030531A1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/34—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase
- C12Q1/37—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase involving peptidase or proteinase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/72—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood pigments, e.g. haemoglobin, bilirubin or other porphyrins; involving occult blood
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/72—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood pigments, e.g. haemoglobin, bilirubin or other porphyrins; involving occult blood
- G01N33/721—Haemoglobin
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- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/795—Porphyrin- or corrin-ring-containing peptides
- G01N2333/805—Haemoglobins; Myoglobins
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- G—PHYSICS
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- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/90—Enzymes; Proenzymes
- G01N2333/914—Hydrolases (3)
- G01N2333/916—Hydrolases (3) acting on ester bonds (3.1), e.g. phosphatases (3.1.3), phospholipases C or phospholipases D (3.1.4)
- G01N2333/918—Carboxylic ester hydrolases (3.1.1)
- G01N2333/92—Triglyceride splitting, e.g. by means of lipase
Definitions
- the present invention relates to a method for measuring HbA1c.
- it is related with the HbA1c measuring method using an automatic analyzer.
- Hemoglobin A1c (HbA1c) is a in which ⁇ chain N-terminal of the HbA1c is glycated, a glycation product of HbA 0 occupying most of the hemoglobin.
- the abundance ratio of HbA1c to the total amount of hemoglobin reflects the average blood glucose level in the past 1 to 2 months from the time of blood collection in the test individual. It's being used.
- the abundance ratio of HbA1c is expressed as a ratio (%) of hemoglobin A1c concentration ( ⁇ mol / L) to hemoglobin concentration ( ⁇ mol / L), and in IFCC value, the ratio of hemoglobin A1c (mmol) to 1 mol of hemoglobin (mmol / L). mol).
- the calculated HbA1c abundance ratio may be collectively referred to as HbA1c%.
- the enzymatic method has been put into practical use in recent years and can be applied to automatic analyzers frequently used in the field of clinical examinations, and also compared to immunoagglutination methods that can also be applied to automatic analyzers.
- the automatic analyzer particularly the reaction cell
- the automatic analyzer is less contaminated by the reagent.
- the inventors of the present invention have been studying the case where whole blood is used as a sample in the enzyme method, and have experienced that it is strongly influenced by coexisting substances in the sample and may cause an error.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a method for avoiding the influence of coexisting substances in the measurement of HbA1c% by an enzyme method using whole blood as a sample.
- the present invention is a method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method, A first step of optically measuring hemoglobin concentration; A second step of optically measuring hemoglobin A1c concentration; When calculating HbA1c% by dividing the hemoglobin A1c concentration measured in the second step by the hemoglobin concentration measured in the first step, the hemoglobin concentration as the denominator measured by the first wavelength satisfies the following Correct using the result measured at the wavelength of 2, A wavelength longer than 480 nm, It is a wavelength that gives an absorbance of 1/10 or less of the absorbance at 480 nm of 100 ⁇ mol / L hemoglobin physiological saline, There is a correlation between fat particle concentration and absorbance, Provide a method.
- the present invention is a method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method, A first step of optically measuring hemoglobin concentration; A second step of optically measuring hemoglobin A1c concentration; When calculating the HbA1c% by dividing the hemoglobin A1c concentration measured in the second step by the hemoglobin concentration measured in the first step, the hemoglobin serving as the denominator measured by the first wavelength selected from 450 nm to 610 nm The concentration is corrected using the result measured at the second wavelength selected from 690 nm to 900 nm, Provide a method.
- the present invention is a method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method,
- the hemoglobin concentration is measured optically in the first step
- Hemoglobin A1c concentration is measured optically in the second step
- the hemoglobin serving as the denominator measured by the first wavelength selected from 450 nm to 610 nm
- the present invention it is possible to correct an error caused by a sample-derived pigment (for example, turbidity due to chyle) in an HbA1c measurement method for a whole blood sample using an automatic analyzer.
- a sample-derived pigment for example, turbidity due to chyle
- the influence of coexisting substances in the sample can be avoided on the automatic analyzer side without changing the composition of the reagent.
- HbA1c% is measured by an enzymatic method using whole blood as a sample, accurate measurement of HbA1c% can be easily performed even for a special specimen (for example, a chyle specimen).
- FIG. 6 is a graph showing an absorption spectrum at 400 nm to 900 nm of a sample containing intralipid.
- the left figure shows measurement results in the range of 400 nm to 900 nm, and the right figure shows an enlarged view of the range of 650 nm to 900 nm.
- FIG. 1 It is a figure which shows the relationship between the hemoglobin density
- the method for measuring HbA1c% by an enzymatic method using an automatic analyzer is large, the first step for optically measuring hemoglobin, the second step for optically measuring HbA1c, and the measured value of the second step for the first step. It consists of the calculation process divided by the measured value
- this measurement method is performed on a whole blood sample, measurement errors due to the influence of coexisting substances such as chyle in the blood may occur.
- the present inventor provides a method for measuring HbA1c%, which can correct the measurement error.
- Embodiment 1 A method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method, A first step of optically measuring hemoglobin concentration; A second step of optically measuring hemoglobin A1c concentration; When calculating HbA1c% by dividing the hemoglobin A1c concentration measured in the second step by the hemoglobin concentration measured in the first step, the hemoglobin concentration as the denominator measured by the first wavelength satisfies the following Correct using the result measured at the wavelength of 2, A wavelength longer than 480 nm, It is a wavelength that gives an absorbance of 1/10 or less of the absorbance at 480 nm of 100 ⁇ mol / L hemoglobin physiological saline, There is a correlation between fat particle concentration and absorbance, Method.
- Embodiment 2 A method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method, A first step of optically measuring hemoglobin concentration; A second step of optically measuring hemoglobin A1c concentration; When calculating the HbA1c% by dividing the hemoglobin A1c concentration measured in the second step by the hemoglobin concentration measured in the first step, the hemoglobin serving as the denominator measured by the first wavelength selected from 450 nm to 610 nm The concentration is corrected using the result measured at the second wavelength selected from 690 nm to 900 nm, Method.
- Embodiment 3 A method for measuring a ratio (HbA1c%) of hemoglobin A1c concentration to hemoglobin concentration in a sample by an enzymatic method, The hemoglobin concentration is measured optically in the first step, Hemoglobin A1c concentration is measured optically in the second step, When calculating the HbA1c% by dividing the hemoglobin A1c concentration measured in the second step by the hemoglobin concentration measured in the first step, the hemoglobin serving as the denominator measured by the first wavelength selected from 450 nm to 610 nm Correcting the concentration using the lipid particle concentration information and hemoglobin concentration information measured at a second wavelength selected from 690 nm to 900 nm; Method.
- the method for measuring HbA1c% basically includes a first step for optically measuring the hemoglobin concentration in a sample, a second step for optically measuring the HbA1c concentration in the sample, and the sample. A step of calculating a ratio (HbA1c%) of the HbA1c concentration to the hemoglobin concentration therein.
- the optical measurement of the sample is performed by measuring the absorbance using light of the first wavelength and light of the second wavelength.
- the hemoglobin concentration measured at the first wavelength is corrected using the measured value at the second wavelength.
- the corrected hemoglobin concentration is used in the HbA1c% calculation step.
- HbA1c% is calculated by dividing the HbA1c concentration measured in the second step by the corrected hemoglobin concentration.
- the corrected hemoglobin concentration is used as the denominator hemoglobin concentration, thereby correcting a measurement error caused by a coexisting substance such as chyle in the sample, and highly accurate HbA1c%. Is measured.
- sample examples include whole blood, red blood cells separated from whole blood, red blood cells separated from whole blood and further washed. Since the method of the present invention can avoid the influence of coexisting substances (such as chyle) in blood, whole blood can be used as a sample without any problem.
- milky specimen refers to a specimen (serum or the like) that is milky white due to the contained fat particles.
- Most of the fat ingested as a meal is neutral fat, and after being absorbed into the blood, it is degraded by enzymes such as lipoprotein lipase and metabolized to fatty acids.
- lipoprotein lipase enzymes
- metabolized to fatty acids enzymes such as lipoprotein lipase and metabolized to fatty acids.
- the fat remains in the blood without being decomposed so much, and the fat appears white, so the sample appears cloudy. This white turbidity is significant in samples collected from individuals with abnormal lipid metabolism regardless of the time of meal.
- Neutral fats in the blood include those absorbed from the diet (mainly chylomicron) and those synthesized in the liver (mainly VLDL).
- Most of the causes of opacities in chyle specimens are chylomicrons that increase transiently after meals.
- the “fat particle” may have a normal meaning in the field of clinical examination or the like, but is preferably a particle (for example, chylomicron or VLDL) composed of fat contained in the chyle specimen.
- a particle for example, chylomicron or VLDL
- lipids derived from soybeans (lecithin, etc.) contained in fat emulsions (for example, intralipids, intralipos, etc.) added to infusion solutions for patient energy supplementation are also included in the fat particles herein. obtain.
- the optical measurement of the HbA1c concentration in the second step of the method of the present invention can basically be carried out according to a conventional method that has been performed with an automatic analyzer so far. Since the second step is performed using a so-called color former, the wavelength in optical measurement is determined by the color former used. Since the second step is performed in the presence of hemoglobin, it is preferable to perform the second step on the longer wavelength side than 480 nm, which has little overlap with the absorption wavelength of hemoglobin. Examples of suitable wavelengths include wavelengths of 550 nm to 750 nm.
- HbA1c% means a ratio (%) of hemoglobin A1c concentration to hemoglobin concentration in a sample, which is usually used in clinical practice.
- HbA1c% is a value defined as an NGSP (National Glycohemoglobin Standardization Program) value, an IFCC (International Federation of ClinicalJet value, a JS value defined as a JC value of an International Federation of Laboratories, and a JS value.
- NGSP National Glycohemoglobin Standardization Program
- IFCC International Federation of ClinicalJet value
- JS value defined as a JC value of an International Federation of Laboratories
- JS value a generic name of these values (refer to Non-Patent Document 1 for the mutual relationship between individual values).
- the calculation of HbA1c% in the method of the present invention may be performed according to standards such as NGSP, IFCC, JDS and the like.
- the enzyme method to which the present invention is applicable is not particularly limited, and a known method can be used.
- a preferable enzyme method as a highly specific measurement method, the glycated dipeptide at the Nb-terminal of the HbA1c ⁇ chain is digested and cleaved with protease in the first reaction, and the hemoglobin concentration is determined at a predetermined wavelength, and the glycated dipeptide is obtained in the second reaction.
- Reagents for measuring HbA1c% based on the enzyme method are sold as in-vitro diagnostic drugs, and these can be used.
- various modifications and alterations in the already reported enzyme method can be appropriately employed.
- a known method such as meth- odization may be used to treat hemoglobin as a fixed structure to stabilize the absorbance.
- a treatment may be performed to facilitate digestion and cleavage of the glycated dipeptide from the HbA1c ⁇ chain by coexisting a surfactant or the like during digestion and cleavage with a protease.
- the “first wavelength” means a wavelength for measuring hemoglobin, and preferably the first light used for optical measurement of hemoglobin concentration in the first step of the method of the present invention. Is the wavelength.
- the first wavelength can be appropriately selected from the range of 450 nm to 610 nm.
- the “second wavelength” means a wavelength for correcting the apparent hemoglobin concentration measured at the first wavelength to a true hemoglobin concentration, and preferably, the first step of the method of the present invention. It is a wavelength of the 2nd light used for the optical measurement in.
- the second wavelength can be appropriately selected from the range of 690 nm to 900 nm.
- the second wavelength is a wavelength longer than 480 nm and a wavelength that gives an absorbance of 1/10 or less of the absorbance at 480 nm of 100 ⁇ mol / L hemoglobin saline solution.
- the measurement by the second wavelength in the first step can be performed first or in parallel after the measurement by the first wavelength.
- wavelength in the terms “first wavelength” and “second wavelength” both refer to a main wavelength, and a so-called “subwavelength” measured for the purpose of background correction or the like. I don't mean.
- inter-item calculation refers to associating a measured value of hemoglobin A1c and a measured value of hemoglobin, which are independently measured, and can be calculated by the calculation function of the automatic analyzer.
- the corrected hemoglobin concentration may be calculated between the measurement value acquisition and the HbA1c% calculation using the first and second wavelengths in the first step. For example, it may be performed immediately after obtaining the measurement values by the first and second wavelengths in the first step, may be performed in parallel with the second step, or may be performed immediately before the calculation of HbA1c%.
- the procedure for calculating the corrected hemoglobin concentration according to the present invention will be described.
- the correction procedure is basically explained or constructed by a test using a fat emulsion that gives the same properties as a chyle specimen (a specimen containing fat particles) or a sample containing an interfering substance reagent for evaluating the performance of the measurement system. can do.
- the fat emulsion include intralipid and intralipos
- examples of the reagent for performance evaluation of the measurement system include interference check A, but are not limited thereto.
- the absorption by the lipid particles is added to the absorption by the hemoglobin, and the absorbance of the entire sample increases.
- the hemoglobin concentration measured at the first wavelength is increased (false increase) relative to the true hemoglobin concentration.
- the lipid particles are converted into hemoglobin.
- the measured pseudo-high-value hemoglobin concentration (pseudo-high-value hemoglobin concentration: X lipid ) is obtained.
- X lipid is an increase in the measured value of hemoglobin concentration due to the first wavelength caused by the lipid particles.
- a plurality of samples containing lipid particles of different concentrations are measured at the second wavelength to examine the change in absorbance depending on the concentration of lipid particles, and the pseudo-high-value hemoglobin concentration (X lipid ) and the second wavelength are measured.
- HbA1c% HbA1c concentration / corrected hemoglobin concentration * 91.5 + 2.15
- the optimal wavelength for the second wavelength is zero absorption by hemoglobin, but there are cases where absorption cannot be made substantially zero due to the concentration of hemoglobin due to sensitivity problems. In such a case, the influence of the hemoglobin concentration on the measurement value at the second wavelength can be corrected by the following.
- a relational expression (regression formula) [formula C] between the hemoglobin concentration (X Hb ) of the sample and the change in the absorbance of the sample (Y Hb ) due to the second wavelength is obtained.
- [Formula C]: Y Hb a 2 X Hb -b 2 (a 2 is a slope, b 2 is an intercept) From this relational expression, a change in absorbance due to the second wavelength depending on the hemoglobin concentration of the sample is obtained.
- the pseudo-high-value hemoglobin concentration X lipid is further corrected to calculate the pseudo-high-value hemoglobin concentration 2: X lipid-2 .
- the intercept b 1 in [Formula A] is a numerical value that varies depending on the hemoglobin concentration represented by “ ⁇ X Hb * a 2 * a 1 ” in [Formula E].
- HbA1c% HbA1c concentration / corrected hemoglobin concentration 2 * 91.5 + 2.15
- the present invention can be suitably used for a method of continuously measuring hemoglobin and HbA1c in the same reaction tank, but the first step and the second step may be performed in separate reaction vessels. For example, in one tank, only the first step is performed to measure hemoglobin, and in another tank, the reagent of the first step is added, but hemoglobin is not measured, and then the second step is performed to perform HbA1c.
- this method can also be used when measuring.
- test sample Intralipid was added to the pooled whole blood so as to have the final concentration shown in Table 1 to prepare a test sample.
- Measurement of test sample Using an automatic analyzer JCA-BM9130 (JEOL Ltd.), the test sample was measured with the following measurement parameters, and HbA1c% was measured. Moreover, the reaction time course in hemoglobin concentration measurement and hemoglobin A1c concentration measurement was confirmed for each test sample.
- the absorbance corrected for the measured value at the main wavelength and the subwavelength immediately before the addition of the coloring reagent is used as the absorbance used for the calculation of the HbA1c concentration. Only the increase in absorbance due to color development of the coloring reagent is used for the calculation of the HbA1c concentration. Therefore, in the HbA1c concentration measurement in this test, it was estimated that no pseudo-high value was observed as in hemoglobin concentration measurement.
- the absorbance of intralipid at 884 nm is represented by (X), and the difference between the measured hemoglobin concentration at 478 nm and the measured hemoglobin concentration of the intralipid-free test sample at 884 nm shown in Table 1 is the hemoglobin concentration by pseudo-highening.
- Example 1 The correction of hemoglobin concentration was examined using a regression equation of pseudo-high-value hemoglobin concentration obtained by measurement at 884 nm.
- Example 2 Although it was confirmed by Example 1 that the false increase in hemoglobin concentration due to the addition of intralipid can be corrected, a slight decrease in HbA1c% in the intralipid-added sample was observed. This was considered to be due to the fact that the absorption of hemoglobin at 884 nm was not zero, so this effect was confirmed.
- Example 4 The correction of the measured value of hemoglobin concentration at 478 nm using the change in absorbance at 884 nm depending on the hemoglobin concentration was examined.
- test sample Each fat emulsion was added to the pooled whole blood so as to have final concentrations shown in Tables 3a to 3c, and test samples were prepared.
- Measurement of test sample Using an automatic analyzer JCA-BM9130 (JEOL Ltd.), the test sample was measured with the following measurement parameters, and HbA1c% was measured.
- test sample Each fat emulsion was added to the pooled whole blood so as to have final concentrations shown in Tables 4a to 4b, and test samples were prepared.
- Measurement of test sample Using an automatic analyzer JCA-BM9130 (JEOL Ltd.), a part of the measurement parameters of Example 5 were changed, the test sample was measured, and HbA1c% was measured. Only the parameters changed from Example 5 are described below.
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Abstract
Description
ヘモグロビン濃度を光学的に測定する第一工程と、
ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、第1の波長により測定した分母となるヘモグロビン濃度を、以下を満たす第2の波長で測定した結果を用いて補正する、
480nmより長波長であり、
100μmol/Lヘモグロビン生理食塩水液の480nmにおける吸光度に対して1/10以下の吸光度を与える波長であり、
脂肪粒子濃度と吸光度の間に相関関係がある波長である、
方法を提供する。
ヘモグロビン濃度を光学的に測定する第一工程と、
ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した結果を用いて補正する、
方法を提供する。
ヘモグロビン濃度は第一工程で光学的に測定され、
ヘモグロビンA1c濃度は第二工程で光学的に測定され、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した脂質粒子の濃度情報及びヘモグロビンの濃度情報を用いて補正する、
方法を提供する。
酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率(HbA1c%)の測定方法であって、
ヘモグロビン濃度を光学的に測定する第一工程と、
ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、第1の波長により測定した分母となるヘモグロビン濃度を、以下を満たす第2の波長で測定した結果を用いて補正する、
480nmより長波長であり、
100μmol/Lヘモグロビン生理食塩水液の480nmにおける吸光度に対して1/10以下の吸光度を与える波長であり、
脂肪粒子濃度と吸光度の間に相関関係がある波長である、
方法。
酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率(HbA1c%)の測定方法であって、
ヘモグロビン濃度を光学的に測定する第一工程と、
ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した結果を用いて補正する、
方法。
酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率(HbA1c%)を測定する方法であって、
ヘモグロビン濃度は第一工程で光学的に測定され、
ヘモグロビンA1c濃度は第二工程で光学的に測定され、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した脂質粒子の濃度情報及びヘモグロビンの濃度情報を用いて補正する、
方法。
[式A]:Xlipid=a1Ylipid-b1(a1は傾き、b1は切片である)
[式B]:補正されたヘモグロビン濃度=みかけのヘモグロビン濃度-偽高値化分ヘモグロビン濃度=みかけのヘモグロビン濃度-(a1Ylipid-b1)
HbA1c%(NGSP%)=HbA1c濃度/補正されたヘモグロビン濃度*91.5+2.15
[式C]:YHb=a2XHb-b2(a2は傾き、b2は切片である)
この関係式により、試料のヘモグロビン濃度に依存した第2の波長による吸光度の変化分が求められる。
[式D]:補正された脂肪粒子の吸光度Ylipid offset=第2の波長による試料の吸光度-第2の波長におけるヘモグロビン濃度に依存した吸光度の変化分=第2の波長における試料の吸光度-YHb
[式E]:偽高値化分ヘモグロビン濃度2:Xlipid-2=補正された脂肪粒子の吸光度Ylipid offset *a1=(第2の波長における試料の吸光度-XHb*a2)*a1
ここで[式A]における切片b1は、[式E]中の「-XHb*a2*a1」で表されるヘモグロビン濃度によって変動する数値であることが理解される。
[式F]補正されたヘモグロビン濃度2=みかけのヘモグロビン濃度-偽高値化分ヘモグロビン濃度2:Xlipid-2=みかけのヘモグロビン濃度-(第2の波長における試料の吸光度-XHb*a2)*a1
HbA1c%(NGSP%)=HbA1c濃度/補正されたヘモグロビン濃度2*91.5+2.15
脂肪乳剤のHbA1c%に与える影響を確認した。
(1)試料:EDTA採血した全血をプールして使用した。以下、プール全血ということがある。
(2)測定試薬とキャリブレータ:
<前処理液>
10mM 亜硝酸ナトリウム
<プロテアーゼ含有基質試薬(R1)>
以下の成分を含む50mM
リン酸ナトリウム緩衝液 pH7.0
1.5% アンヒトール20BS(花王社)
2.0 mg/mL プロチンPC10F(大和化成工業社)
0.01% アジ化ナトリウム(キシダ化学社製)
50μM DA-67(10-(カルボキシメチルアミノカルボニル)-3,7-ビス(ジメチルアミノ)フェノチアジンナトリウム、和光純薬工業社)
<発色試薬(R2)>
以下の成分を含む50mM
リン酸ナトリウム緩衝液 pH7.0
10U/mL フルクトシルペプチドオキシダーゼ(キッコーマン社)
1U/mL パーオキシダーゼ(東洋紡社)
<キャリブレータ>
ノルディアNHbA1cキャリブレータ(積水メディカル社)を使用した。
(3)脂肪乳剤:イントラリピッド(フレゼニウス カービ社)を使用した。
(1)試験試料の調製:プール全血に対して表1の終濃度になるようイントラリピッドを添加し、試験試料を調製した。
(2)試験試料の測定:自動分析装置JCA-BM9130(日本電子社)を用い、以下の測定パラメータにより試験試料を測定し、HbA1c%を測定した。
また、各試験試料毎に、ヘモグロビン濃度測定、ヘモグロビンA1c濃度測定における反応タイムコースを確認した。
[HbA1c,Hb]
分析方法:EPA
計算方法:MSTD
測定波長(副/主):HbA1c 805/658、Hb 805/478
主DET.Pl-P.m-P.n:HbA1c 0-95-98、Hb 0-44-47
副DET.P.p-P.r:HbA1c 44-47、Hb 0-0
反応時間:10分
血球測定時:
希釈検体量(全血量):4.0μL
希釈液量(希釈液):110μL
キャリブレータ測定時:
希釈検体量(キャリブレータ):25μL
希釈液量(希釈液):15μL
反応検体量(Sample量):6.4μL
第1試薬量(R1):60μL、第2試薬量:0μL、
第3試薬量(R2):20μL、第4試薬量:0μL
(1)各測定値の変動
試験試料中のイントラリピッドの濃度に依存したヘモグロビン濃度測定値の増加とHbA1c%の低下が確認された。その一方、HbA1c濃度測定値は、ほぼ一定であった(以上、表1)。以上より、HbA1c%の低下は、HbA1c%算出の際の分母となるヘモグロビン濃度測定値の増加に起因すると考えられた。
各試験試料毎のヘモグロビン濃度測定、HbA1c濃度測定における反応タイムコースを図1に示した。全ての試験試料について、ヘモグロビン濃度測定(図1左)及びHbA1c濃度測定(図1右)における、イントラリピッドの濃度に依存した吸光度の増加が確認された。本参考例で使用した自動分析装置JCA-BM9130のような一般的な自動分析装置によるヘモグロビン濃度測定では、検出された吸光度それ自体がヘモグロビン濃度の算出に用いられる。そのため、本試験では、イントラリピッドに由来する吸光度の増加がそのままヘモグロビンの吸光度に上乗せされた結果、表1のようにヘモグロビン濃度測定値が偽高値化したものと推定された。一方、本参考例で使用した自動分析装置によるHbA1c濃度測定では、HbA1c濃度の算出に用いる吸光度として発色試薬添加直前の主波長や副波長での測定値による補正が行われた吸光度を用いるため、発色試薬の発色による吸光度の増加分のみがHbA1c濃度の算出に用いられる。そのため本試験でのHbA1c濃度測定では、ヘモグロビン濃度測定のような偽高値化が観察されなかったものと推定された。
試験試料の吸収スペクトル解析(図2)の結果、ヘモグロビン及び発色試薬の発色時における吸収が少なく、かつイントラリピッドの濃度と相関する吸収波長として約690nm~約900nmの範囲の波長が見出された。この中から884nmを選択し、表1で観察されたようなイントラリピッドに由来するヘモグロビン濃度の偽高値化との相関関係を確認した。
884nmにおけるイントラリピッドの吸光度を(X)とし、表1のイントラリピッド各濃度の478nmにおけるヘモグロビン濃度測定値と884nmにおけるイントラリピッド無添加試験試料のヘモグロビン濃度測定値の差を偽高値化によるヘモグロビン濃度上昇分(偽高値化分ヘモグロビン濃度:Y)とし、両者の相関係数(R2)及び回帰式(Y=aX-b)を求めた。
相関係数:R2=0.9836で、回帰式:Y=1427.6X-4.7512[式A1]が得られ、偽高値化分ヘモグロビン濃度がイントラリピッドに起因することが確認された(図3)。
884nmでの測定により得られた偽高値化分ヘモグロビン濃度の回帰式を利用して、ヘモグロビン濃度の補正を検討した。
参考例2で得られた回帰式[式A1]より[式B1]を導き、[式B1]により478nmでのヘモグロビン濃度測定値(みかけのヘモグロビン濃度)の補正を行い、補正後のヘモグロビン濃度を用いてHbA1c%を算出した。
[式B1]
補正後のヘモグロビン濃度
=みかけのヘモグロビン濃度-偽高値化分ヘモグロビン濃度
=みかけのヘモグロビン濃度-(884nmでの吸光度*1400-5)
なお、1400は回帰式の傾きを簡略化した数値であり、-5は切片を簡略化した数値である。
2.結果
[式B1]により求めた補正後のヘモグロビン濃度で算出したHbA1c%はイントラリピッド無添加の値と近似し、イントラリピッドの濃度に依存した値の低下も観察されなかった(表2)。
実施例1により、イントラリピッド添加によるヘモグロビン濃度の偽高値化を補正できることが確認されたが、イントラリピッド添加試料におけるHbA1c%の若干の低値化が認められた。これは、884nmにおけるヘモグロビンの吸収がゼロではないことが影響していると考えられたため、この影響を確認した。
(1)試料:パネル検体(洗浄血球)(積水メディカル社)3種類(レベル1、3、5)〔HbA1c値:5.0%(レベル1);8.0%(レベル3);11.8%(レベル5)〕
(2)前処理液:参考例1に記載の前処理液を使用した。
各パネル検体を前処理液で7倍及び80倍に希釈したヘモグロビン濃度調整液を調製し、両液を適宜に混合して、HbA1c%は一定でヘモグロビン濃度の異なる測定試料を各レベルについてそれぞれ11種類調製した。希釈検体量(血球量)を2.0μLとした以外は、参考例1と同様の手順を使用して測定試料のHbA1c%を測定した。ヘモグロビン濃度の補正は、実施例1と同様に[式B1]により行った。
[式B1]による補正前と補正後でHbA1c%が一致せず、ヘモグロビン濃度に依存して両者の差が拡大した(図4)。
ヘモグロビン濃度に依存した884nmでの吸光度の変動の補正を検討した。
実施例2で使用した884nmで測定した各パネル検体のヘモグロビン濃度を(x)、884nmにおける該各パネル検体の吸光度の変化分を(y)とし、両者の相関係数(R2)及び回帰式(y=ax-b)を求めた。
2.結果
相関係数:R2=0.9844で、回帰式:y=3.82*10-5x-0[式C1]が得られた。884nmにおいてヘモグロビン濃度に依存した吸光度変化が存在することが再度確認された(図5)。
ヘモグロビン濃度に依存した884nmでの吸光度変化分を利用した、478nmにおけるヘモグロビン濃度測定値の補正を検討した。
実施例3で得られた回帰式[式C1]により、ヘモグロビン濃度に依存した884nmでの吸光度の変化分を求め、これを利用して884nmにおけるイントラリポス(大塚製薬工場社)による正味のヘモグロビン濃度上昇分を求める[式D1]を導き、次いで、[式D1]を利用した計算式([式E1])により、偽高値化分ヘモグロビン濃度の補正値を算出した。これらを踏まえ、最終的に、補正ヘモグロビン濃度を求める[式F1]を導いた。
[式C1]
ヘモグロビン濃度に依存した884nmでの吸光度の変化分=ヘモグロビン濃度x3.82*10-5
[式D1]
884nmにおけるイントラリポスによる正味の吸光度上昇分=884nmの吸光度-([式C1]で得られる値)
[式E1]
偽高値化分ヘモグロビン濃度の補正値=([式D1]で得られる値)*1400
[式F1]
補正ヘモグロビン濃度
=478nmより算出されるヘモグロビン濃度-([式E1]で得られる値)
=1.055*ヘモグロビン濃度-884nm吸光度*1400
[式F1]の妥当性を確認した。
(1)試料:プール全血を使用した。
(2)測定試薬とキャリブレータ:参考例1と同様の測定試薬、キャリブレータを使用した。
(3)脂肪乳剤類:イントラリピッド、イントラリポス(大塚製薬工場社)、干渉チェックAプラス乳び(シスメックス)を使用した。
(1)試験試料の調製:プール全血に対して表3a~3cの終濃度になるよう各脂肪乳剤類を添加し、試験試料を調製した。
(2)試験試料の測定:自動分析装置JCA-BM9130(日本電子社)を用い、以下の測定パラメータにより試験試料を測定し、HbA1c%を測定した。
[HbA1c,Hb]
分析方法:EPA
計算方法:MSTD
測定波長(副/主):HbA1c 805/658、Hb 805/478
主DET.Pl-P.m-P.n:HbA1c 0-95-98、Hb 0-44-47
副DET.P.p-P.r:HbA1c 44-47、Hb 0-0
反応時間:10分
血球測定時:
希釈検体量(血球量):4.0μL
希釈液量(希釈液):110μL
キャリブレータ測定時
希釈検体量(キャリブレータ):25μL
希釈液量(希釈液):15μL
反応検体量(Sample量):6.4μL
第1試薬量(R1):60μL、第2試薬量:0μL、
第3試薬量(R2):20μL、第4試薬量:0μL
分析方法:EPA
計算方法:ABS
測定波長(副/主):Hb なし/884nm
FV=1
主DET.Pl-P.m-P.n:Hb 0-44-47
副DET.P.p-P.r:Hb 0-0
反応時間:10分
血球測定時:
希釈検体量(血球量):4.0μL
希釈液量(希釈液):110μL
キャリブレータ測定時
希釈検体量(キャリブレータ):25μL
希釈液量(希釈液):15μL
反応検体量(Sample量):6.4μL
第1試薬量(R1):60μL、第2試薬量:0μL、
第3試薬量(R2):20μL、第4試薬量:0μL
*884nmのキャリブレーションには生理食塩水を使用する。
[補正Hb]
桁数:1 定性判定:しない
X:884nm Y:Hb
項目間演算式:1.055*Y-1400*X⇒[式F1]
[NGSP%]
桁数:2 定性判定:しない
X:HbA1c Y=補正Hb
項目間演算式:X/Y*91.5+2.15
各脂肪乳剤類添加の成績を表3a~3cに示した。[式F1]を用いて補正を行った場合、脂肪乳剤類の種類によらず、HbA1c%の偽高値化を補正できることが確認された。
[式F1]が884nm波長の代わりに751nm波長を用いた場合、及びNGSP%の代わりにIFCCに基づくHbA1c%測定においても有効であることを確認した。
(1)試料:プール全血を使用した。
(2)測定試薬とキャリブレータ:参考例1と同様の測定試薬、キャリブレータを使用した。
(3)脂肪乳剤類:イントラリピッドを使用した。
(1)試験試料の調製:プール全血に対して表4a~4bの終濃度になるよう各脂肪乳剤類を添加し、試験試料を調製した。
(2)試験試料の測定:自動分析装置JCA-BM9130(日本電子社)を用い、実施例5の測定パラメータを一部変更して試験試料を測定し、HbA1c%を測定した。
なお、実施例5から変更したパラメータのみを以下に記載した。
[884nm]→[751nm]
測定波長(副/主):Hb なし/884nm→測定波長(副/主):Hb なし/751nm
[補正Hb]
桁数:1 定性判定:しない
X:751nm Y:Hb
項目間演算式:1.053*Y-896*X⇒751nm用[式F1]
[NGSP%]
桁数:2 定性判定:しない
X:HbA1c Y=補正Hb
項目間演算式:X/Y*91.5+2.15
[補正Hb]
桁数:1 定性判定:しない
X:751nm Y:Hb
項目間演算式:1.053*Y-896*X⇒751nm用[式F1]
[IFCC値]
桁数:2 定性判定:しない
X:HbA1c Y=補正Hb
項目間演算式:X/Y*1000+0
751nm用[式F1]を用いて補正を行ったところ、NGSP%の場合もIFCC値の場合も、イントラリピッドの影響を受けずにHbA1c%を算出することができた(表4a~4b)。
実検体を用い[式F1]の有効性を確認した。
(1)試料:EDTA採血した全血350例(TG値が基準範囲内であり、かつ目視で濁りを認めない)を使用した。
(2)測定試薬とキャリブレータ:参考例1と同様の測定試薬、キャリブレータを使用した。
(1)試料の測定:自動分析装置JCA-BM9130(日本電子社)を用い、実施例5に記載の測定パラメータにより試験試料を測定し、[式F1]を用いて478nmヘモグロビン濃度の補正を行い、HbA1c%を測定した。
[式F1]による補正前のHbA1c%を(x)、補正後のHbA1c%を(y)として相関性を確認した。結果、相関係数:R2=0.9999で、回帰式:y=0.993x+0.0199が得られ、実検体を測定した場合においても、本発明の方法が使用できることが確認された(図6)。
Claims (3)
- 酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率の測定方法であって、
ヘモグロビン濃度を光学的に測定する第一工程と、
ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、第1の波長により測定した分母となるヘモグロビン濃度を、以下を満たす第2の波長で測定した結果を用いて補正する、
480nmより長波長であり、
100μmol/Lヘモグロビン生理食塩水液の480nmにおける吸光度に対して1/10以下の吸光度を与える波長であり、
脂肪粒子濃度と吸光度の間に相関関係がある波長である、
方法。 - 酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率の測定方法であって、
前記ヘモグロビン濃度を光学的に測定する第一工程と、
前記ヘモグロビンA1c濃度を光学的に測定する第二工程を有し、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した結果を用いて補正する、
方法。 - 酵素法による試料中のヘモグロビン濃度に対するヘモグロビンA1c濃度の比率を測定する方法であって、
前記ヘモグロビン濃度は第一工程で光学的に測定され、
前記ヘモグロビンA1c濃度は第二工程で光学的に測定され、
該第二工程で測定したヘモグロビンA1c濃度を該第一工程で測定したヘモグロビン濃度で除してHbA1c%を算出する際に、450nm~610nmから選択された第1の波長により測定した分母となるヘモグロビン濃度を、690nm~900nmから選択された第2の波長で測定した脂質粒子の濃度情報及びヘモグロビンの濃度情報を用いて補正する、
方法。
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| CN201780048846.4A CN109563535B (zh) | 2016-08-10 | 2017-08-10 | HbA1c的测定法 |
| US16/324,414 US11220704B2 (en) | 2016-08-10 | 2017-08-10 | Method for measuring HbA1c |
| EP17839595.0A EP3498860B1 (en) | 2016-08-10 | 2017-08-10 | Method for measuring hba1c |
| ES17839595T ES2925195T3 (es) | 2016-08-10 | 2017-08-10 | Método de medición de HbA1c |
| JP2018533572A JP7028778B2 (ja) | 2016-08-10 | 2017-08-10 | HbA1cの測定法 |
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| EP (1) | EP3498860B1 (ja) |
| JP (1) | JP7028778B2 (ja) |
| KR (1) | KR102502572B1 (ja) |
| CN (1) | CN109563535B (ja) |
| ES (1) | ES2925195T3 (ja) |
| WO (1) | WO2018030531A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113196064A (zh) * | 2019-01-29 | 2021-07-30 | 美国西门子医学诊断股份有限公司 | 降低血红蛋白A1c测定中的英脱利匹特/脂血干扰的浊度归一化算法和方法 |
| WO2023188476A1 (ja) * | 2022-03-31 | 2023-10-05 | ソニーグループ株式会社 | 濃度測定装置 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116930101A (zh) * | 2022-03-30 | 2023-10-24 | 深圳迈瑞生物医疗电子股份有限公司 | 用于检测糖化血红蛋白的生化分析仪及检测方法 |
| CN117717334B (zh) * | 2024-02-07 | 2024-07-05 | 荣耀终端有限公司 | 数据获取方法及电子设备 |
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- 2017-08-10 KR KR1020197003861A patent/KR102502572B1/ko active Active
- 2017-08-10 ES ES17839595T patent/ES2925195T3/es active Active
- 2017-08-10 EP EP17839595.0A patent/EP3498860B1/en active Active
- 2017-08-10 CN CN201780048846.4A patent/CN109563535B/zh active Active
- 2017-08-10 US US16/324,414 patent/US11220704B2/en active Active
- 2017-08-10 WO PCT/JP2017/029185 patent/WO2018030531A1/ja not_active Ceased
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113196064A (zh) * | 2019-01-29 | 2021-07-30 | 美国西门子医学诊断股份有限公司 | 降低血红蛋白A1c测定中的英脱利匹特/脂血干扰的浊度归一化算法和方法 |
| JP2022512004A (ja) * | 2019-01-29 | 2022-02-01 | シーメンス・ヘルスケア・ダイアグノスティックス・インコーポレイテッド | ヘモグロビンA1cアッセイにおける濁度正規化アルゴリズム及びイントラリピッド/脂肪血症干渉を低減する方法 |
| EP3918342A4 (en) * | 2019-01-29 | 2022-03-23 | Siemens Healthcare Diagnostics, Inc. | OPACITY NORMALIZATION ALGORITHM AND METHODS FOR REDUCING INTRALIPID/LIPEMIA INTERFERENCE IN HEMOGLOBIN A1C ASSAYS |
| US11300577B1 (en) | 2019-01-29 | 2022-04-12 | Siemens Healthcare Diagnostics Inc. | Turbidity normalization algorithm and methods of reducing intralipid/lipemia interference in hemoglobin A1c assays |
| JP7097514B2 (ja) | 2019-01-29 | 2022-07-07 | シーメンス・ヘルスケア・ダイアグノスティックス・インコーポレイテッド | ヘモグロビンA1cアッセイにおける濁度正規化アルゴリズム及びイントラリピッド/脂肪血症干渉を低減する方法 |
| CN115508568A (zh) * | 2019-01-29 | 2022-12-23 | 美国西门子医学诊断股份有限公司 | 降低血红蛋白A1c测定中的英脱利匹特/脂血干扰的浊度归一化算法和方法 |
| WO2023188476A1 (ja) * | 2022-03-31 | 2023-10-05 | ソニーグループ株式会社 | 濃度測定装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109563535A (zh) | 2019-04-02 |
| ES2925195T3 (es) | 2022-10-14 |
| US11220704B2 (en) | 2022-01-11 |
| JPWO2018030531A1 (ja) | 2019-06-13 |
| EP3498860A1 (en) | 2019-06-19 |
| EP3498860A4 (en) | 2020-04-01 |
| CN109563535B (zh) | 2023-02-07 |
| JP7028778B2 (ja) | 2022-03-02 |
| EP3498860B1 (en) | 2022-08-03 |
| KR20190037254A (ko) | 2019-04-05 |
| US20190169674A1 (en) | 2019-06-06 |
| KR102502572B1 (ko) | 2023-02-22 |
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