Davis's Lab & Diagnostic Tests

Lactose Tolerance Test

Lactose Tolerance Test is a topic covered in the Davis's Lab & Diagnostic Tests.

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Common Use:
To assess for lactose intolerance or other metabolic disorders.

Plasma collected in a gray-top (fluoride/oxalate) tube.

Normal Findings:
(Method: Spectrophotometry)

Change in Glucose Value*Conventional UnitsSI Units (Conventional Units × 0.0555)
NormalGreater than 30 mg/dLGreater than 1.7 mmol/L
Inconclusive20–30 mg/dL1.1–1.7 mmol/L
AbnormalLess than 20 mg/dLLess than 1.1 mmol/L
*Compared to fasting sample for infants, children, adults, and older adults.

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