Lactose Tolerance

0020407
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Example Reports
Standard

Ordering Recommendation

Detect lactase deficiency.

Mnemonic

LACTOL

Methodology

Quantitative Enzymatic Assay

Performed

Sun-Sat

Reported

Within 24 hours

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Recommend drawing specimens for baseline (fasting), 30 minutes, 60 minutes, 120 minutes, and 180 minutes after lactose load (lactose may be obtained from a hospital pharmacy). Fasting patient should be given 50 g lactose in 200-300 mL water consumed in 5 to 10 minutes. Note: If severe lactase deficiency is suspected, the dose should be lowered.

Collect

Gray (sodium fluoride/potassium oxalate). Collect separate tube for each timed point.

Specimen Preparation

Separate plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL plasma for each time point to individual ARUP Standard Transport Tubes. (Min: 0.5 mL per timed determination)

Storage/Transport Temperature

Frozen.

Unacceptable Conditions
Remarks
Stability

After separation from cells: Ambient: 24 hours; Refrigerated: 72 hours; Frozen: 1 year

Reference Interval

Fasting glucose: 64-128 mg/dL
Normal lactose tolerance: 20-30 mg/dL elevation in glucose over fasting level after 50 g lactose load.

Interpretive Data

A less than 20 mg/dL increase in glucose over the fasting level, with gastrointestinal symptoms after a lactose load is considered abnormal and consistent with lactase deficiency.

Compliance Category

FDA

Note

Glucose in whole blood at room temperature undergoes glycolysis at a rate of approximately 7 percent each hour.

Hotline History

View Hotline History

 

Hotline History

Date of Change
Test Name Change
Methodology
Performance/Reported Schedule
Specimen Requirements
Reference Interval
Interpretive Data
Note
CPT Code
Component Change
Other Interface Change
New Test
Inactive
08/16/2021
X
N/A

CPT Codes

82951; 82952 x2

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Components

Component Test Code* Component Chart Name LOINC
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Disaccharide Absorption Test
  • Oral Lactose Tolerance
Lactose Tolerance