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Lab Test Dictionary

Cortisol, Free, 24-Hour Urine with Creatinine, LC/MS/MS (11280X)


Liquid Chromatography, Tandem Mass Spectrometry (LC/MS/MS)

Specimen Type

Urine, Timed Collection

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days

6 Days a week

Standard TAT

5 Days

Collection Information

Specimen Required

2 mL Urine from a 24 Hour Urine Collection

Container Type

24-Hour Urine Container

Collection Instructions

Urine collected in a 24-hour urine container without preservative is preferred. 25 mL 6N HCI, 10 mL conc. glacial acetic acid, or 10 g Boric Acid are acceptable preservatives. Reference ranges do not apply to random urine samples.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 48 Hours; Refrigerated: 7 Days; Frozen: 5 Months

Test Volume Required

2 mL Urine

Minimum Test Volume

0.5 mL Urine

Processing Instructions

Record 24-hour urine volume on test request form and urine vial. Reference ranges do not apply to random urine samples.

CPT Codes