Lab ranges
9 entries
2-hour glucose, 75 g OGTT — lab reference
Normal <140; prediabetes 140-199; diabetes ≥200.
Beta-hydroxybutyrate — lab reference
Fasting, ketogenic diets, illness, and diabetes context materially affect interpretation.
C-peptide, fasting — lab reference
Ask your clinician to read this result with concurrent glucose, kidney function, and exogenous insulin use.
Fasting insulin — lab reference
No universal reference or treatment target. Standardize fasting duration and collection time.
Fasting plasma glucose — lab reference
Normal <100; prediabetes 100-125; diabetes ≥126 on confirmatory testing unless unequivocal hyperglycemia.
Fructosamine — lab reference
Assay-specific; reflects approximately 2-3 weeks and is affected by protein turnover.
Hemoglobin A1C — lab reference
Normal <5.7; prediabetes 5.7-6.4; diabetes ≥6.5. Altered RBC turnover can make A1C unreliable.
HOMA-IR — lab reference
Formula-dependent and population-dependent. Dr. Purser to define clinic interpretation, if used.
Random plasma glucose — lab reference
Diabetes may be diagnosed at ≥200 with classic symptoms or hyperglycemic crisis.
About these ranges
These are Dr. Purser’s adult reference ranges. Units, symptoms and health history matter when you discuss a result with your clinician.
