what does hemoglobin test for

The hemoglobin A1C (HbA1c) test is a blood test that measures the average blood sugar (glucose) levels over the past 2 to 3 months. It is primarily used to:

• Diagnose Prediabetes and Diabetes:
  • Normal: Below 5.7%
  • Prediabetes: 5.7% to 6.4%
  • Diabetes: 6.5% or above
• Monitor Diabetes Management: It helps assess how well blood sugar levels are controlled over time.
• Assess Risk of Complications: Higher A1C levels are linked to an increased risk of diabetes-related complications.

The test works by measuring the percentage of hemoglobin (a protein in red blood cells) that is coated with sugar. Since red blood cells regenerate every 3 months, the A1C test provides a long-term view of blood sugar levels.

For more details, visit CDC's A1C Test Page.