Lactose Tolerance Test, 5 Specimens (50g)
Use
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.
Special Instructions
Fasting required: no consumption of food or beverage other than water for at least 8 hours before testing. The test cannot be performed at a patient service center because of the preparation step required for the Lactol solution. Immediately after fasting specimen is obtained, patient ingests a 50 g dose of lactose (client‑supplied or LacTest prepared), followed by timed draws at ½, 1, 2, and 3 hours.
Limitations
Not provided.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
Result Turnaround Time
1 day
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL each specimen
Minimum Volume
0.5 mL
Container
Fluoride/oxalate (gray‑top) tubes (preferred); also sodium or lithium heparin (green‑top); serum separated from cells immediately (SST tubes)
Collection Instructions
Obtain fasting specimen, then lactose ingestion, then collect specimens at ½, 1, 2, and 3 hours and label each with draw time.
Patient Preparation
Fasting for at least 8 hours; no food or beverage except water.
Causes for Rejection
Use of unacceptable anticoagulants (other than fluoride/oxalate or heparin), unseparated serum/plasma submissions.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 28 days |