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Fasting Plasma Glucose

FPG Fasting Blood Sugar FBS FBG
Fluoride oxalate (grey top) or EDTA mmol/L

About this test

Blood glucose after ≥8 hours of fasting. Used to diagnose diabetes and impaired fasting glucose.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 3.9 – 5.6 Normal fasting. IFG: 5.6–6.9; Diabetes: ≥7.0 on two occasions

Clinical Interpretation

Low / Decreased
Hypoglycaemia (<3.9) — insulin excess, alcohol, Addison's disease, hepatic failure, insulinoma.
High / Increased
Hyperglycaemia — diabetes mellitus, pre-diabetes (IFG), stress hyperglycaemia, glucocorticoids, Cushing's.

Related Tests

HbA1c Fasting Insulin C-Peptide
Specimen
Fluoride oxalate (grey top) or EDTA
Reporting Unit
mmol/L
Category
🧪 Clinical Biochemistry

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.