HbA1c

HbA1c measures the amount of sugar attached to the haemoglobin in your red blood cells, which reflects your average blood glucose over the previous two to three months. Unlike a single glucose reading, it is not affected by your most recent meal.

This makes HbA1c a key test for screening for and monitoring diabetes and prediabetes. A higher result may indicate that blood sugar has been raised over time, and it is widely used to track glucose control.