Specimen Requirements
Title
Lactose Tolerance Test, 5 Specimens (50g)
Specimen Requirement
8 hour fast required.
Immediately after a fasting specimen is obtained, have patient ingest a 50 g dose of lactose. Draw subsequent specimens 1/2, 1, 2 and 3 hours later. Label each with the specific draw time.
Collect 5 SST/ 1.0 mL each, after 30 minutes of clotting, promptly centrifuge, indicate time on tubes and send.
Methodology
Spectrophotometry (SP)
Stability
Room temp: 4 days, Refrigerated: 7 days, Frozen: 28 days
Reference Range
By Report*
Turnaround
1-2 days, Performed Monday-Saturday
Clinical Use
Test includes: Fasting, 30 minute, 1 hour, 2 hour, 3 hour
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 Code
LT5SP