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Original Articles

Abnormally Decreased HbA1c Can Be Assessed With Erythrocyte Creatine in Patients With a Shortened Erythrocyte Age

  1. Yufei Jiao, MD, MSC,
  2. Toshika Okumiya, PHD,
  3. Toshiji Saibara, MD, PHD,
  4. Keunsik Park, MD, PHD and
  5. Masahide Sasaki, MD, PHD
  1. Department of Laboratory Medicine, Department of Internal Medicine, Kochi Medical School Nankoku
  2. Department of Medical Informatics, Osaka City University Osaka, Japan
  3. Faculty of Medicine, Osaka City University Osaka, Japan
  1. Address correspondence and reprint requests to Toshika Okumiya, PhD, Department of Laboratory Medicine, Kochi Medical School, Oko-cho, Nankoku 783-8505, Japan. E-mail: okumiyat/kms{at}kochi-ms.ac.jp
Diabetes Care 1998 Oct; 21(10): 1732-1735. https://doi.org/10.2337/diacare.21.10.1732
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Abstract

OBJECTIVE To investigate whether erythrocyte creatine can serve as a corrective index for HbA1c in patients with a shortened mean age of erythrocytes.

RESEARCH DESIGN AND METHODS HbA1c and creatine in density-fractionated erythrocytes from 18 normal subjects were measured. HbA1c and erythrocyte creatine in the whole blood of 43 patients with liver cirrhosis (LC), 14 patients with hemolytic anemia (HA), 38 other patients with high reticulocyte counts (HRC) (>2.2%), and 59 normal subjects were also measured. The patients in this study all had normal blood glucose levels. A correction formula derived from the linear regression equation for the correlation between HbA1c and erythrocyte creatine was used to correct the patients' HbA1c values.

RESULTS Among density-fractionated erythrocytes, the young cells exhibited low HbA1c and high creatine values. With progressively increasing density, HbA1c gradually increased and creatine gradually decreased. In the whole blood samples, the HbA1c values were significantly lower (P < 0.001) in LC, HA, and HRC patients than in normal subjects. By contrast, the erythrocyte creatine values were significantly higher (P < 0.001) in LC, HA, and HRC patients than in normal subjects. A linear correlation between HbA1c Cy) and erythrocyte creatine (x) was observed (y = −0.224x + 5.00; n = 154; r = −0.70; P < 0.001). Based on the regression equation, a correction formula was obtained. Low HbA1c values (<4.3%) were found in 24 of the 43 LC patients, 12 of the 14 HA patients, and 20 of the 38 HRC patients. After correction of the HbA1c values, 15 of the 24 LC patients, 9 of the 12 HA patients, and 16 of the 20 HRC patients had HbAlc values within the normal range.

CONCLUSIONS HbA1c decreased in inverse proportion to the increase in erythrocyte creatine because of a shortened mean age of erythrocytes. The abnormally decreased HbA1c value could be assessed with erythrocyte creatine.

  • Received April 14, 1998.
  • Revision received June 29, 1998.
  • Accepted June 29, 1998.
  • Copyright © 1998 by the American Diabetes Association

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October 1998, 21(10)
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Abnormally Decreased HbA1c Can Be Assessed With Erythrocyte Creatine in Patients With a Shortened Erythrocyte Age
Yufei Jiao, Toshika Okumiya, Toshiji Saibara, Keunsik Park, Masahide Sasaki
Diabetes Care Oct 1998, 21 (10) 1732-1735; DOI: 10.2337/diacare.21.10.1732

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Abnormally Decreased HbA1c Can Be Assessed With Erythrocyte Creatine in Patients With a Shortened Erythrocyte Age
Yufei Jiao, Toshika Okumiya, Toshiji Saibara, Keunsik Park, Masahide Sasaki
Diabetes Care Oct 1998, 21 (10) 1732-1735; DOI: 10.2337/diacare.21.10.1732
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