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Hemoglobin a1c may be an inadequate diagnostic tool for diabetes mellitus in anemic subjects

Jung Il Son1, Sang Youl Rhee, Jeong-Taek Woo

  • 1Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea.

Diabetes & Metabolism Journal
|November 8, 2013
PubMed

Insights

Anemia can affect hemoglobin A1c (HbA1c) test results. This study found lower specificity of HbA1c for diagnosing diabetes mellitus in anemic individuals, suggesting limitations for this marker in anemia.

Area of Science:

  • Clinical Chemistry
  • Hematology
  • Endocrinology

Background:

  • Hemoglobin A1c (HbA1c) is a key diagnostic criterion for diabetes mellitus (DM).
  • HbA1c levels can be influenced by various factors, including anemia.
  • The impact of anemia on HbA1c varies with its underlying cause.

Purpose of the Study:

  • To investigate the effect of anemia on HbA1c levels.
  • To evaluate the diagnostic utility of HbA1c in anemic individuals suspected of DM.

Main Methods:

  • Compared HbA1c and oral glucose tolerance test results in anemic subjects (n=112) and non-anemic controls (n=217).
  • Assessed the sensitivity and specificity of HbA1c for DM diagnosis across subgroups.
  • Subjects were drug-naive and suspected of having DM.

Main Results:

  • Mean HbA1c was not significantly different in subjects with normal glucose levels.
  • Anemic subjects showed modestly higher mean HbA1c when glucose levels indicated prediabetes or DM.
  • The specificity of HbA1c for DM diagnosis was significantly lower in the anemic group (P<0.05).

Conclusions:

  • The diagnostic accuracy of HbA1c for diabetes mellitus may be compromised in patients with anemia.
  • Anemia is an important consideration when interpreting HbA1c results.
  • Further research may be needed to establish alternative diagnostic markers for DM in anemic populations.
Abstract

Keywords:
AnemiaDiabetes mellitusDiagnosisHemoglobin A, glycosylated

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