HbA1c (Diabetes Marker)

Measurement of glycated haemoglobin (HbA1c), which reflects average blood glucose levels over the preceding 8 to 12 weeks. Unlike fasting glucose, HbA1c is not affected by short-term dietary changes or acute stress, making it the most reliable single marker for diagnosing and monitoring diabetes. Values of 5.7 to 6.4 percent indicate pre-diabetes, while 6.5 percent and above confirms diabetes according to WHO and ADA criteria.

HbA1c measures the percentage of haemoglobin molecules in red blood cells that have been irreversibly glycated — chemically bonded to glucose molecules in proportion to the average blood glucose concentration over the red cell's lifespan of approximately 120 days. This provides a time-averaged metabolic picture that a single fasting glucose measurement cannot match, as glucose levels fluctuate dramatically throughout the day based on meals, exercise, stress, and sleep. The diagnostic thresholds are well established: an HbA1c below 5.7 percent is considered normal, 5.7 to 6.4 percent indicates pre-diabetes (a state of impaired glucose metabolism where lifestyle intervention can prevent progression), and 6.5 percent or above meets the diagnostic criteria for type 2 diabetes. For patients already diagnosed with diabetes, HbA1c is the primary monitoring tool, with treatment targets typically set between 6.5 and 7.0 percent depending on individual risk factors. One important consideration is that conditions affecting red blood cell turnover (haemolytic anaemia, significant blood loss, iron deficiency, or recent transfusion) can produce misleading HbA1c values. SYNLAB München Zentrum uses HPLC or immunoassay methods certified to the IFCC reference standard. No fasting is required, and blood can be drawn at any time of day. Results are typically available within one working day.