ARUP's Laboratory Test Directory

Cortisol, Free : 0098391

Mnemonic: FCORTS

Methodology: Equilibrium Dialysis/Quantitative Electrochemiluminescent Immunoassay
Performed: Tue, Sat
Reported: 1-5 days
Specimen Required: Collect: Plain red or serum separator tube. Also acceptable: Lavender (EDTA) or pink (K2EDTA).

Specimen Preparation: Centrifuge specimen. Separate serum or plasma from cells within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.6 mL) Label plainly as a.m. or p.m. collection.

Storage/Transport Temperature: Frozen.

Unacceptable Conditions: Specimens collected in plasma separator tubes containing heparin. Grossly hemolyzed or heparinized specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 4 hours; Refrigerated: 5 days; Frozen: 3 months

Reference Interval:
8-10 a.m. collection 0.31-1.19 µg/dL
4-6 p.m. collection 0.15-0.94 µg/dL

Interpretive Data:

Refer to Statement B under Testing Information at http://www.aruplab.com.
Note: To convert to nmol/L, multiply µg/dL by 27.6.
CPT Code(s): 82530