HbA1c

Understanding the marker

HbA1c reflects average blood sugar over roughly 8-12 weeks and supports diabetes assessment in appropriate clinical circumstances.

HbA1c reflects average blood sugar over roughly 8-12 weeks. Conditions that change red blood cells or their lifespan can affect the measurement. It does not show rapid changes in blood sugar, and diagnostic interpretation may require confirmation with other testing.

What does high HbA1c mean?

A high HbA1c usually reflects a higher average blood sugar over recent weeks. Its meaning depends on other results and factors affecting red blood cells. A clinician assesses whether diagnostic confirmation or a review of an existing treatment plan is needed.

What does low HbA1c mean?

A low HbA1c may reflect a lower average blood sugar, but changes in red blood cells can also lower the result. An unexpectedly low value is assessed with glucose measurements and the blood count.