Diabetes
Fasting Glucose
Also known as: FBS
What it means
Blood sugar after 8+ hours without food. The basic diabetes screening test.
Typical normal range
Normal: 70–99 mg/dL · Pre-diabetes: 100–125 · Diabetes: ≥126
Reference ranges vary by lab, age, sex, and pregnancy. Always check the range on your own report.
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Related terms in Diabetes
HbA1c
Your average blood sugar over the last 2–3 months. Doctors prefer it to fasting sugar because it doesn't get fooled by what you ate that morning.
PPBS
Blood sugar 2 hours after a meal. Shows how well your body handles food; elevated PPBS with normal fasting is an early diabetes clue.
OGTT
A challenge test — drink 75 g glucose, measure sugar at 0, 1, and 2 hours. Standard test for gestational diabetes and unclear cases.
Fasting Insulin
The amount of insulin your pancreas makes at rest. High insulin with normal sugar suggests insulin resistance (pre-diabetes territory).
This is a plain-language explanation for patients, not clinical advice. AI can be wrong. Always confirm with your doctor.