Glucose (Fasting) (GLU)
Blood sugar level measured after an 8+ hour fast. The primary screen for diabetes and prediabetes.
Typical normal range
70–99 (normal) · 100–125 (prediabetes) mg/dL
If high ↑
Diabetes (≥ 126), prediabetes (100–125), stress hyperglycemia
If low ↓
Hypoglycemia: excess insulin, fasting, alcohol, adrenal insufficiency
What is a normal Glucose (Fasting) level?
A typical reference range is 70–99 (normal) · 100–125 (prediabetes) mg/dL. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Glucose (Fasting) level mean?
Diabetes (≥ 126), prediabetes (100–125), stress hyperglycemia. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Glucose (Fasting) level mean?
Hypoglycemia: excess insulin, fasting, alcohol, adrenal insufficiency. Your doctor will interpret it alongside your symptoms and other tests.
About the Metabolic Panel
A metabolic panel checks blood sugar, electrolytes and kidney function. It gives a broad picture of how your body handles energy and balances fluids.
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Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.