Lactose Tolerance Test, 5 Specimens (50g)

Lactose Tolerance Test, 5 Specimens (50g)

Test Code

7675
82951, 82952 (x2)
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
7675
82951, 82952 (x2)
CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering.
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano | Quest Nichols Institute -San Juan Capistrano, CA. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.

Clinical Significance

Lactose Tolerance Test, 5 Specimens (50g) - Results may be used to evaluate deficiency of small bowel mucosal lactase, which may be associated with intolerance to lactose, manifested by diarrhea and other symptoms following ingestion of milk.

Test Resources

None found for this test
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Test Details

Includes

  • Fasting specimen, 1/2-hour, 1-hour, 2-hour, and 3-hour specimens

Patient Preparation

Note: This cannot be performed at a patient service center because of the preparation step required for the lactol solution.

Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.

Methodology

Spectrophotometry (SP)

LOINC® Codes, Performing Laboratory

Service Area must be determined
Fasting specimen, 1/2-hour, 1-hour, 2-hour, and 3-hour specimens
Note: This cannot be performed at a patient service center because of the preparation step required for the lactol solution.

Fasting required. Fasting is defined as no consumption of food or beverage other than water for at least 8 hours before testing.

Methodology

Spectrophotometry (SP)
Service Area must be determined

Preferred Specimen(s)

Five - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes

Alternative Specimen(s)

Plasma collected in: Lithium heparin (green-top) tube • Sodium heparin (green-top) tube • Serum (separated from cells immediately) • Spun serum separator tube (SST)

Minimum Volume

0.5 mL for each specimen

Collection Instructions

Obtain fasting specimen. Immediately after fasting specimen is obtained, have the patient ingest a 50 g dose of lactose (obtained through client supply). Collect subsequent specimens 1/2, 1, 2, and 3 hours, labeling each sample at the time of draw with the specific draw time.

LacTest Preparation instructions: If using LacTest, dissolve two 25 g packets into 6-8 oz of water to make the 50 g dose required. Mix thoroughly. Because of the relative insolubility of lactose, mix frequently during ingestion as necessary. If any lactose precipitate remains in the glass, swirl with a small amount of additional water and drink.

For pediatric use, dissolve 1 gram of LacTest for every 1 kg (2.2 lbs) of the patient's body weight in 6-8 oz of water.

Transport Container

Fluoride/oxalate (gray-top) tubes

Transport Temperature

Room temperature

Specimen Stability

  • Sodium fluoride plasma
  • Room temperature: 7 days
  • Refrigerated: 7 days
  • Frozen: 28 days
  •  
  • Heparinized plasma
  • Room temperature: 48 hours
  • Refrigerated: 7 days
  • Frozen: 28 days
  •  
  • Serum
  • Room temperature: 4 days
  • Refrigerated: 7 days
  • Frozen: 28 days
  •  
  • Whole blood (gray-top) tube
  • Room temperature: 24 hours
  • Refrigerated: 72 hours
  • Frozen: Unacceptable
  •  
  • Note: Serum and plasma submissions must be separated from cells.

Reject Criteria

Unspun serum or plasma separator tube (SST or PST) • Red-top or green-top tube (serum or heparinized plasma not separated from cells) • Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate

Setup Schedule

Service Area must be determined
Five - 1 mL plasma specimens collected in fluoride/oxalate (gray-top) tubes
Plasma collected in: Lithium heparin (green-top) tube • Sodium heparin (green-top) tube • Serum (separated from cells immediately) • Spun serum separator tube (SST)
0.5 mL for each specimen
Obtain fasting specimen. Immediately after fasting specimen is obtained, have the patient ingest a 50 g dose of lactose (obtained through client supply). Collect subsequent specimens 1/2, 1, 2, and 3 hours, labeling each sample at the time of draw with the specific draw time.

LacTest Preparation instructions: If using LacTest, dissolve two 25 g packets into 6-8 oz of water to make the 50 g dose required. Mix thoroughly. Because of the relative insolubility of lactose, mix frequently during ingestion as necessary. If any lactose precipitate remains in the glass, swirl with a small amount of additional water and drink.

For pediatric use, dissolve 1 gram of LacTest for every 1 kg (2.2 lbs) of the patient's body weight in 6-8 oz of water.
Fluoride/oxalate (gray-top) tubes
Room temperature
Sodium fluoride plasma
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

Heparinized plasma
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 28 days

Serum
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 28 days

Whole blood (gray-top) tube
Room temperature: 24 hours
Refrigerated: 72 hours
Frozen: Unacceptable

Note: Serum and plasma submissions must be separated from cells.
Unspun serum or plasma separator tube (SST or PST) • Red-top or green-top tube (serum or heparinized plasma not separated from cells) • Anticoagulants other than lithium heparin, sodium heparin or fluoride/oxalate
Service Area must be determined
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano | Quest Nichols Institute -San Juan Capistrano, CA. Please provide SERVICE AREA INFORMATION to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.
Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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