Hemoglobin A1c (HbA1c) measured by high-performance liquid chromatography (HPLC)

This test helps your doctor check how well your body is working and look for early signs of illness. It may be ordered to confirm or rule out a condition, monitor an ongoing health problem, or see how well a treatment is working over time.

Your doctor may order an HbA1c test to check if your blood sugar levels are consistently high, which can indicate diabetes or prediabetes. It’s often used to monitor long-term blood sugar control in people with diabetes or those at risk of developing it.

The test is usually done with a small sample of blood, urine, or another body fluid, depending on what your doctor has ordered. A trained staff member collects the sample, which is then sent to a laboratory where specialized equipment measures the levels being checked.

A small blood sample is taken from your arm, usually during a routine visit to your doctor’s office. The sample is then analyzed using a specialized HPLC machine to measure the percentage of hemoglobin A1c in your blood.

Your results are compared with a reference range, which is the level typically seen in most healthy people. A value outside this range does not always mean you are ill, so your doctor will consider your symptoms, medical history, and other test results before making a diagnosis.

The result shows the average blood sugar levels over time. While specific ranges vary by lab and individual health, higher levels may suggest poor blood sugar control, while lower levels may indicate better management.

Doctors order this test for many everyday reasons, including routine checkups, new or unexplained symptoms, monitoring chronic conditions such as diabetes or thyroid disease, screening for early signs of illness, and checking whether a medication is working or causing side effects.

HbA1c testing is commonly done for people with diagnosed diabetes, those with symptoms of high blood sugar, or those with a family history of diabetes. It’s also used to assess treatment effectiveness and adjust medication if needed.