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Related Experiment Videos

Glycated hemoglobin in hypoglycemia.

V Niketic1, V Djurdjic, V Stojkovic

  • 1Department of Chemistry, Faculty of Science, University of Belgrade, Yugoslavia.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|February 28, 1989
PubMed
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Hypoglycemia significantly lowers sugar bound to hemoglobin (HbA1c). A new HbA1x fraction appears in hypoglycemia, impacting glycated hemoglobin measurements in insulinoma and diabetic patients.

Area of Science:

  • Endocrinology
  • Clinical Chemistry
  • Metabolic Disorders

Background:

  • Glycated hemoglobin (HbA1c) is a key biomarker for long-term glycemic control in diabetes.
  • Hypoglycemia, or low blood sugar, can occur in patients with insulinoma or diabetes treated with insulin.
  • The impact of frequent hypoglycemic episodes on HbA1c measurement accuracy is not fully understood.

Purpose of the Study:

  • To investigate the effect of hypoglycemia on glycated hemoglobin levels.
  • To determine if hypoglycemia influences the accuracy of standard HbA1c measurements.
  • To identify potential new glycated hemoglobin fractions formed during hypoglycemia.

Main Methods:

  • Study involved patients with hyperinsulinism (insulinoma) and diabetic patients experiencing frequent hypoglycemia.

Related Experiment Videos

  • Quantification of sugar bound to total hemoglobin in normal, hyperglycemic, and hypoglycemic blood samples.
  • Measurement of total HbA1 fraction using the mini-column method.

    • Main Results:

    • Samples from hypoglycemic episodes showed significantly lower amounts of sugar bound to total hemoglobin compared to normal or hyperglycemic samples.
    • The mini-column method indicated a higher total HbA1 fraction than expected based on total glycated hemoglobin values in hypoglycemic samples.
    • Evidence suggests the presence of a previously unrecognized HbA1 constituent, termed HbA1x, during hypoglycemia.

    Conclusions:

    • Hypoglycemia significantly alters glycated hemoglobin levels, leading to potentially underestimated HbA1c values.
    • A novel HbA1 constituent (HbA1x) is formed during hypoglycemia, affecting standard HbA1c assays.
    • These findings highlight the need to consider hypoglycemic events when interpreting HbA1c results in affected patients.