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Glucose, Fasting
Panel: Metabolic, Kidney & Electrolytes · All metabolic & kidney tests
Typical adult reference range
| Conventional units | 70–99 mg/dL |
| SI units | 3.9–5.5 mmol/L |
Ranges vary between laboratories and methods — compare your result with the range printed on your own report.
What a high or low result can mean
High glucose, fasting: high values can be seen in diabetes mellitus and with acute illness or steroid use.
Low glucose, fasting: low values may occur with prolonged fasting, certain medications, or excess insulin.
These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.
Good to know
Requires fasting, usually for at least 8 hours, with water allowed.
Related tests — Metabolic, Kidney & Electrolytes
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.