Hemoglobin A1c (HbA1c) with serum immunoassay measurement

What HbA1c Tests Measure

HbA1c is a form of hemoglobin (the protein in red blood cells that carries oxygen) that has been attached to sugar (glucose) from your blood. This test quantifies how much of your hemoglobin is bound to glucose, providing a snapshot of your average blood sugar levels over time. Unlike blood sugar tests that measure current levels, HbA1c gives insight into trends, making it useful for long-term diabetes care.

Why It Matters in Diabetes Management

HbA1c is a key indicator for managing diabetes because it helps healthcare providers assess whether your blood sugar levels are consistently within target ranges. It’s particularly useful for people with type 1 or type 2 diabetes, as it reduces the need for frequent daily blood glucose checks.

How the Test Works

Your blood sample is collected and analyzed using an immunoassay method, which detects the presence of hemoglobin A1c molecules. The test measures the percentage of hemoglobin in your red blood cells that is bound to glucose, providing a stable reading that doesn’t fluctuate with daily blood sugar swings.

What Normal Results Mean

While specific reference ranges can vary by lab, HbA1c results are typically interpreted as follows: lower values suggest better blood sugar control, while higher values indicate poorer control. Results are often reported as a percentage (e.g., 5.7%–6.4% is considered prediabetes, while 6.5% or higher may indicate diabetes).