Blood sugar
Learn what fasting glucose measures, what high fasting blood sugar can mean, and how normal, prediabetes, and diabetes ranges are usually interpreted.
Educational guide only — not medical advice. Always review results with a qualified clinician.
Fasting blood sugar (fasting glucose) is usually measured after 8-12 hours of fasting. In many labs, normal fasting glucose is below 100 mg/dL, prediabetes starts around 100-125 mg/dL, and diabetes may be considered at 126 mg/dL or above on repeat testing. Exact ranges can vary by lab and guideline.
A single high fasting glucose result does not diagnose diabetes on its own. Doctors often compare it with HbA1c, and sometimes with an OGTT, to understand whether the pattern fits prediabetes, diabetes, or a temporary change. If you also want to understand early insulin resistance, see our HOMA-IR guide.
If the result comes from a chemistry panel, our metabolic panel guide shows how glucose is usually read alongside sodium, potassium, bicarbonate, and kidney markers.
Discuss your result with a clinician, especially if you have repeat high values, symptoms of high blood sugar, or a family history of diabetes.
For information only. Related guides: HbA1c result meaning · HOMA-IR · metabolic panel · Analyze
Trust & review
This article is educational and should be reviewed alongside our medical review, methodology, and transparency pages. Use it to prepare for a clinician conversation, not as a diagnosis.
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