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Lactose Tolerance Test
MessageTest performed at York Hospital Laboratory.
Test Code
LTT
CPT Codes
82951, 82952x2
Includes
- Fasting Glucose
- 30 Min Glucose
- 60 Min Glucose
- 90 Min Glucose
- 120 Min Glucose
Preferred Specimen
0.2 mL Serum, each specimen
Instructions
1st specimen obtained is fasting.
The adult patient is given a 50g dose of Lactose, and specimens are obtained 30 min, 60 min, 90 min, and 120 min later.
The adult patient is given a 50g dose of Lactose, and specimens are obtained 30 min, 60 min, 90 min, and 120 min later.
Transport Container
Serum Separator Tube
Green Top Lithium Heparin Tube also acceptable
Green Top Lithium Heparin Tube also acceptable
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: 1 year
Refrigerated: 7 days
Frozen: 1 year
Methodology
Spectrophotometry
Setup Schedule
Daily
Report Available
Next Day
Reference Range
An increase in plasma glucose >30 mg/dL is normal. An increase in plasma glucose <20 mg/dL over the fasting level, with symptoms, is considered abnormal and is evidence for lactase deficiency.
A flat curve can be defined as an increase <20 mg/dL and is seen in most subjects with lactose deficiency who are not diabetic.
Up to 20% incidence of false-positives and false-negatives is reported.
A flat curve can be defined as an increase <20 mg/dL and is seen in most subjects with lactose deficiency who are not diabetic.
Up to 20% incidence of false-positives and false-negatives is reported.
Clinical Significance
The lactose tolerance test gauges your body's reaction to a liquid that contains high levels of lactose. During the two hours after drinking the liquid, blood will be drawn to measure the amount of glucose in the bloodstream. If the glucose level doesn't rise, it means your body isn't properly digesting and absorbing the lactose-filled drink.
