Fasting Glucose — Baseline Metabolic Marker
Blood glucose measured after a fast of at least 8 hours, read against the published normal (70–99 mg/dL), prediabetes (100–125) and diabetes (126+) cut-offs.
Fasting glucose is the blood glucose level measured after a fast of at least 8 hours, read against published normal, prediabetes and diabetes cut-offs.
Watch the 34-second version
The cheapest metabolic number on your panel, and the one most people read too generously.
Transcript & sources → All videosMr. Age is AgeGen's editorial character. Facts come from the protocol above.
The biomarker
- Name: Fasting Glucose
- Units: mg/dL
- Standard reference range (per MedlinePlus and NIDDK): 70–99 (normal); 100–125 (prediabetes); ≥ 126 on two separate tests (diabetes). Ranges vary by lab.
How to read your result
| Value (mg/dL) | Interpretation |
|---|---|
| < 70 | May be normal for some people, mainly those who are thin and young — discuss with your clinician |
| 70–99 | Normal |
| 100–125 | Prediabetes (impaired fasting glucose) |
| ≥ 126 | Diabetes range — confirmed by a repeat test on a different day; see your clinician |
What to do with the result
- Preparation. Fast for at least 8 hours before the draw (water only); the test is most reliable in the morning.
- Testing. A result in the prediabetes or diabetes range is confirmed with a repeat test on a different day. The A1C test, which needs no fasting, can be used alone or with other tests.
- Clinician. Discuss any result outside 70–99 mg/dL with your clinician.
Why this test is worth asking for
- It is one fasted draw with published cut-offs for normal, prediabetes and diabetes.
- A result in the prediabetes or diabetes range is confirmed by a repeat test, and the A1C test can be used alongside it.
Related protocols
- HbA1c — Three-Month Glucose Average
- Urine ACR — Albumin-to-Creatinine Kidney Marker
- Uric Acid — Metabolic + Gout Marker
Sources
- MedlinePlus — Blood Glucose Test
- NIDDK — Diabetes Tests & Diagnosis
- MedlinePlus — Blood sugar test (encyclopedia)
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
