Hemoglobin A1c (HbA1c) with Peripheral Blood Collection for Confirmation of Diabetes Status

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of diabetes (like frequent urination, extreme thirst, or unexplained weight changes), if you have prediabetes, or if you’re monitoring long-term blood sugar control. It’s also used to confirm a diabetes diagnosis or check if your current treatment plan is working.

How Is the Test Performed?

A small blood sample is taken from your arm or finger using a needle. The blood is then processed to measure the percentage of hemoglobin (the oxygen-carrying protein in red blood cells) that is bound to a form of sugar (glycated hemoglobin). This test does not require fasting.

What Does the Test Result Mean?

The result shows the proportion of your red blood cells that have sugar attached to their hemoglobin. While exact reference ranges vary by lab, higher levels generally indicate poorer long-term blood sugar control, while lower levels may suggest better management. Your doctor will interpret the result in the context of your overall health and treatment plan.

What Are Common Causes of Abnormal Results?

Factors like recent illness, severe infections, or certain medications (e.g., some blood pressure or chemotherapy drugs) can temporarily affect HbA1c levels. If your result is unusually high or low, your doctor may ask for additional testing or review your treatment.