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Choose collection locationDiabetes · Individual laboratory test
HbA1c reflects glucose attached to red blood cells over roughly the last two to three months. A single meal has little effect on it.
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
Understanding the test
Also called Glycated Hemoglobin (3-Month Sugar)
HbA1c can help assess long-term glucose control or support diagnosis where appropriate. It does not require a fasting appointment for the test alone.
The test provides a different perspective from an individual finger-stick or venous glucose result.
Serial HbA1c can help assess the overall glucose pattern after a prescribed change.
Before your sample
HbA1c itself needs no fast. Tell the clinician about a recent transfusion, significant blood loss, known haemoglobin variant or current anaemia, which can affect interpretation.
The clinician takes blood from a vein into a tube that keeps it from clotting. The collection team sends the labelled specimen to the laboratory.
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A trend reflects the glucose exposure of circulating red cells. Recent transfusion, blood loss or certain haemoglobin variants can complicate that interpretation.
From sample to follow-up

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Choose collection locationLook for HbA1c in your report. Use the sample type and collection time when comparing it with an earlier report.
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If HbA1c and home readings appear inconsistent, bring your glucose record and discuss any condition that might affect red blood cells.
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They describe different time periods. Anaemia, a recent transfusion or changes in red cell lifespan can also make HbA1c less representative.
HbA1c measures glucose attached to haemoglobin inside red blood cells. Iron-deficiency anaemia can make it read higher than expected. Recent blood loss or a condition that shortens red-cell survival may make it read lower. If HbA1c and your glucose readings disagree, tell your clinician about anaemia, blood loss or recent treatment.
Yes. The test needs no fasting and can be taken at any time of day. It reflects the previous two to three months, so a result taken soon after Ramadan partly shows how your sugars ran during the fast.
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Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.