How does the HbA1c test work?

The HbA1c test works by measuring the percentage of haemoglobin that has glucose attached to it, known as glycated haemoglobin. Since red blood cells live for about 3 months, the test reflects average blood sugar levels over that period. A higher percentage of glycated haemoglobin indicates higher blood sugar levels, while a lower percentage suggests better blood sugar control. This test is widely used for diagnosing diabetes and monitoring how well a patient’s treatment plan is working. It provides a reliable long-term view of blood sugar management.