Methodology
High Performance Liquid Chromatography (HPLC)
Specimen Type
Urine, Timed Collection
Performing Lab
Quest Diagnostics San Juan Capistrano
Epic ID
LAB01242
Lab Test Days
Tuesday, Thursday, Friday
Standard TAT
5-9 Days
Collection Information
Specimen Required
5-10 mL 24 Hour Urine
Container Type
24-Hour Urine Container
Collection Instructions
Patient should avoid food high in indoles: avocados, banana, tomato, plum, walnut, pineapple, and eggplant. Patient should also avoid tobacco, tea and coffee three days prior to specimen collection. Collect 24 hour urine with 25 mL of 6N HCl to maintain a pH below 3. Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen. Keep urine refrigerated during collection if preservative is not used.
Processing Information - Lab Use Only
Transport Temperature
Refrigerate-OK/Frozen-OK/Ambient-OK
Specimen Stability
Room Temp: 7 Days; Refrigerated: 30 Days; Frozen: 30 Days
Test Volume Required
10 mL 24 Hour Urine
Minimum Test Volume
5 mL 24 Hour Urine
Processing Instructions
Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen. Keep urine refrigerated during collection if preservative is not used. Record 24 hour urine volume in comments, on specimen and batch sheet.
Included Tests
Creatinine
CPT Codes
83497, 82570
Revised
06-05-16
Initials
SL