SAMPLE REQUIRED : 10 mL aliquot of 24 hour urine. Collect urine with appropriate volume of 50 % HCI to maintain pH between 1 -2. Record 24 hour volume on test request form and urine container. Ship refrigerated or frozen.

TEST PREPARATION : Patient should strictly avoid theophylline,chocolate,vanilla,banana,alcoholic beverages,tea/coffee,tobacco and strenuous exercise at least  24 hours before and during specimen collection.

REPORT TAT: 7 DAYS