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Cortisol, Free, 24-Hour Urine with Creatinine, LC/MS/MS [11280X]Test Code
2 mL aliquot of an unpreserved 24-hour urine submitted in a plastic, leak-proof container
Other Acceptable Specimens
Aliquot of a preserved 24-hour urine preserved in 25 mL 6N HCl, or 10 mL concentrated glacial acetic acid, or 10 grams boric acid
Collect 24-hour urine without preservative (preferred). Record 24-hour urine volume on test request form and urine vial.
Refrigerated (cold packs)
Room temperature: 48 hours
Refrigerated: 7 days
Frozen: 5 months
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
See Laboratory Report
Urinary Free Cortisol is useful in the detection of patients with Cushing's syndrome for whom Free Cortisol concentrations are elevated.
Quest Diagnostics Nichols Institute San Juan Capistrano
33608 Ortega Highway
San Juan Capistrano, CA 92675