Hemoglobin A1c (HbA1c) with High-Performance Liquid Chromatography (HPLC) Method

What HbA1c Measures

HbA1c measures the proportion of hemoglobin molecules that have sugar (glucose) chemically bound to them. This binding occurs when blood sugar levels are consistently high, which can damage blood vessels over time. The test provides a snapshot of your average blood sugar levels over the preceding months, helping to assess long-term glucose control.

Why It’s Done

Doctors order HbA1c tests primarily for people with diabetes or those at risk of developing it. It’s also used to monitor treatment effectiveness, detect undiagnosed diabetes, or evaluate prediabetes. Regular HbA1c checks help prevent complications like nerve damage, kidney disease, or heart disease.

How It’s Performed

A small blood sample is taken from your arm, usually via a needle. The sample is processed to separate hemoglobin from other blood components and analyzed using high-performance liquid chromatography (HPLC), which separates and measures the different types of hemoglobin, including HbA1c.

What the Results Mean

Results are typically reported as a percentage. While exact reference ranges vary by lab, higher percentages generally indicate poorer blood sugar control. For example, a result above 6.5% may suggest diabetes, while lower values (below 5.7%) may indicate good control. Your doctor will interpret results in the context of your overall health and treatment plan.