Accelerated Aging Linked to Rising Cancer Risk in Under-50s, Study Finds

Hemoglobin A1c, commonly known as HbA1c or glycated hemoglobin, is a crucial laboratory test used to monitor long-term blood sugar control in people with diabetes. This test measures the percentage of hemoglobin proteins in red blood cells that have glucose attached to them. Since red blood cells typically live for about three months, the HbA1c test provides an average picture of blood sugar levels over the past two to three months, making it more comprehensive than daily glucose measurements that only show blood sugar levels at a single point in time.

The formation of glycated hemoglobin occurs naturally when glucose in the bloodstream binds to hemoglobin. The higher the blood glucose levels over time, the more glucose becomes attached to hemoglobin molecules. This process happens continuously throughout the lifespan of red blood cells. For people without diabetes, normal HbA1c levels typically range from 4 to 5.6 percent. A level between 5.7 and 6.4 percent indicates prediabetes, suggesting an increased risk of developing type 2 diabetes. An HbA1c level of 6.5 percent or higher on two separate tests is one of the criteria used to diagnose diabetes.

Healthcare providers use the HbA1c test for multiple purposes. It helps diagnose type 2 diabetes and prediabetes, though it is not typically used for diagnosing type 1 diabetes or gestational diabetes. For people already diagnosed with diabetes, regular HbA1c testing helps monitor how well their treatment plan is working. The American Diabetes Association generally recommends that most adults with diabetes aim for an HbA1c level below 7 percent, though individual targets may vary based on age, overall health, and other factors. Testing frequency depends on the type of diabetes, treatment plan, and how well blood sugar levels are controlled, but it is commonly performed every three to six months.

Several factors can affect HbA1c test results. Conditions that affect red blood cell turnover, such as anemia, recent blood loss, blood transfusions, or certain genetic hemoglobin variants, may lead to inaccurate results. Kidney disease, liver disease, and certain medications can also influence test outcomes. The test requires a simple blood sample and no special preparation like fasting is needed, making it convenient for patients. Understanding HbA1c results helps patients and healthcare providers make informed decisions about diabetes management, including adjustments to diet, exercise, and medication to achieve better blood sugar control and reduce the risk of diabetes-related complications.