Free cortisol is useful in the detection of patients with Cushing's syndrome for whom free cortisol concentrations are elevated.
Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn.
2.0 mL Serum from a Red Top Tube in a Plastic Vial
2.0 mL Plasma from a Lavender Top Tube - EDTA in a Plastic Vial
4 hours Ambient
7 days Refrigerated (Transport)
2 years Frozen
0.7 mL
| Adult | |||||
| 8:00 A.M.-10:00 A.M. | 0.07-0.93 | µg/dL | |||
| 4:00 P.M.-6:00 P.M. | 0.04-0.45 | µg/dL | |||
| 10:00 P.M.-11:00 P.M. | 0.04-0.35 | µg/dL | |||
Patients taking vitamin supplements containing high doses of biotin (>5 mg/day) may have falsely increased test results generated.
Free cortisol is useful in the detection of patients with Cushing's syndrome for whom free cortisol concentrations are elevated.
8 Days
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