MedDroid
Explain my report
Fasting Blood Sugar: normal range & what your result means
Fasting blood glucose is measured after 8 hours without food. It is a first-line test for diabetes and prediabetes.
Typical adult reference range
| Measure | Range |
|---|---|
| Normal | 70–99 mg/dL |
| Prediabetes | 100–125 mg/dL |
| Diabetes | ≥ 126 mg/dL (confirmed) |
What a HIGH result can mean
- 100–125 mg/dL = prediabetes; ≥126 (on two tests) = diabetes
- Very high readings with symptoms need prompt care
What a LOW result can mean
- Below ~70 mg/dL is low (hypoglycaemia): shakiness, sweating, confusion — treat with fast sugar
Ranges vary by lab. Reference ranges are TYPICAL ADULT values and vary by laboratory, age, sex, pregnancy and the method used. Always read your result against the range printed on YOUR report, and let your doctor interpret it alongside your history.
Frequently asked questions
How long should I fast before this test?
Usually 8–12 hours of no food or drink except water. Take it in the morning, and check with your doctor about any medicines beforehand.
What level means diabetes?
A fasting glucose of 126 mg/dL or above, confirmed on a second test, indicates diabetes; 100–125 is prediabetes. HbA1c is often checked alongside.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.