Fasting Glucose

Description

Fasting glucose measures the concentration of glucose in your blood after an overnight fast (usually 8–12 hours). It’s one of the simplest and most widely used markers for assessing baseline blood sugar regulation and early insulin resistance.

Why it matters

Persistently elevated fasting glucose can be an early signal that the body is struggling to keep glucose in range—often due to insulin resistance. Over time, this pattern increases the risk of prediabetes, type 2 diabetes, and cardiovascular disease. However, fasting glucose is only one snapshot; pairing it with A1c, triglycerides, and (when available) insulin/C-peptide gives a clearer metabolic picture.

Interpreting results (general)

Common clinical categories (may vary slightly by lab/guideline):

• Normal: < 100 mg/dL

• Prediabetes: 100–125 mg/dL

• Diabetes: ≥ 126 mg/dL (typically confirmed on repeat testing)

What can shift fasting glucose

Sleep debt, stress, acute illness, late meals, alcohol, and certain medications (like corticosteroids) can raise glucose. Regular exercise, improved diet quality, and weight loss (when appropriate) tend to lower it over time.

Educational only, not medical advice. If fasting glucose is elevated, confirm with repeat testing and review personalized targets and next steps with a clinician.