Which serum parameter is commonly elevated in diabetes mellitus and used for diagnostic assessment?

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The key idea is using a test that reflects long-term, average glucose exposure rather than a single, momentary value. HbA1c measures the percentage of hemoglobin that has glucose bound to it, forming glycated hemoglobin. Because red blood cells live about 120 days, HbA1c provides a readout of average blood glucose over roughly 2–3 months. This makes it stable and convenient for diagnosing diabetes, with commonly used thresholds around 6.5% or higher indicating diabetes, while lower ranges point to prediabetes or normal glycemia. Glucose levels can be elevated too, but they fluctuate with meals and fasting status, limiting their reliability for a single diagnostic test. Lipids and creatinine reflect other aspects of health (lipid metabolism and kidney function, respectively) and aren’t diagnostic of diabetes.