Understanding Lab Tests for Hyperglycemia
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Hyperglycemia is a condition characterized by excessively high levels of glucose (sugar) in the blood. It is most commonly associated with diabetes but can also result from other medical conditions, medications, or stress. Blood tests are the primary diagnostic tools for detecting and monitoring hyperglycemia.
Top Recommended Test
Glucose, Serum
This test directly measures the current level of glucose in the blood serum. Chronic high serum glucose levels indicate hyperglycemia, which is typically associated with uncontrolled or undiagnosed diabetes. Elevated glucose can also be caused by other medical conditions such as pancreatitis, Cushing syndrome, and certain medications.
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Diagnosing Hyperglycemia
Because hyperglycemia symptoms can be subtle or absent in early stages, blood testing is essential for accurate diagnosis. These tests measure glucose levels directly or provide information about long-term blood sugar control, helping healthcare providers determine appropriate treatment strategies.
Other Relevant Tests
Hemoglobin (Hgb) A1c With eAG Estimation
This test measures average blood glucose levels over the past 2-3 months by evaluating glycated hemoglobin. High levels of estimated average glucose (eAG) indicate hyperglycemia and provide valuable information about long-term glucose control, making it particularly useful for diagnosing and monitoring diabetes-related hyperglycemia.
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Understanding Your Results
Normal fasting glucose levels are typically below 100 mg/dL, while levels of 126 mg/dL or higher may indicate diabetes. A1c levels of 6.5% or higher suggest diabetes, while levels between 5.7% and 6.4% may indicate prediabetes. Your healthcare provider will interpret these results in the context of your symptoms and medical history.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
