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Medical Emergencies · single question

What does HbA1c measure?

  1. Glycated hemoglobin, reflecting average blood glucose over approximately the preceding 3 months
  2. Current, real-time blood glucose level only
  3. Total hemoglobin concentration unrelated to glucose
  4. Platelet-bound glucose
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Correct answer: A. Glycated hemoglobin, reflecting average blood glucose over approximately the preceding 3 months

HbA1c measures glycated (glycosylated) hemoglobin — glucose that has become bound to hemoglobin within circulating red blood cells over their lifespan — providing an average measure of blood glucose control over approximately the preceding 3 months (tied to the average RBC lifespan), rather than a real-time glucose snapshot.

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