Below the range
Common causes of a low Glucose, Fasting
- Excess insulin or sulfonylureas
- Prolonged fasting
- Adrenal insufficiency
- Insulinoma
Looking for the other direction? See what causes a high Glucose, Fasting.
All tests · Glucose & Diabetes · Glucose, Fasting
Below the range
What causes a low Glucose, Fasting?
Normal range 70-99 mg/dL (3.9-5.5 mmol/L SI). Specimen: Serum or plasma (fasting). See the full Glucose, Fasting reference page for critical values and nursing considerations.
What is the normal range for Glucose, Fasting?
The standard teaching reference range for Glucose, Fasting is 70-99 mg/dL in conventional units, or 3.9-5.5 mmol/L in SI units. This value is measured in serum or plasma (fasting).
| Specimen | Serum or plasma (fasting) |
|---|---|
| Conventional range | 70-99 mg/dL |
| SI range | 3.9-5.5 mmol/L |
| Critical value | < 50 or > 400 mg/dL |
| Panel | Glucose & Diabetes |
Full details, including nursing considerations, on the Glucose, Fasting normal range page. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
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