Serum
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Cortisol – Free by LC/MS, Serum
Test ID: FCORTQST S
Test
Method
Chromatography/Mass Spectrometry
Specimens
Clinical Utility
Free cortisol is useful in the detection of patients with Cushing’s syndrome for whom free cortisol concentrations are elevated.
Test Version
19-Nov-2025
Specimen
Specimens
Serum
Collection Containers
Preferred
Red top (no additive)
Acceptable
Lavender top (EDTA)
Sample Volume
2.0 mL
Minimum Volume
0.7 mL
Stability
| Ambient | 2 days |
|---|---|
| Refrigerated | 7 days |
| Frozen | 730 days |
Rejection Criteria
| Hemolysis | Gross |
|---|---|
| Specimen | Gel Separator tube |
Test Version
19-Nov-2025
Performance / Interpretation
Method
Chromatography/Mass Spectrometry
Turnaround Time
12 days
Results
| Name | Units | Reference Range | Conversion Factor | |
|---|---|---|---|---|
| CORTISOL,FREE | mcg/dL |
|
||
Test Version
19-Nov-2025
Interface / Setup
HL7 Interface Codes
| Order Code | Result Codes | Units |
|---|---|---|
| FCORTQST S | 66072CORTISOL,FREE,LC/MS,S | mcg/dL |
Test Version
19-Nov-2025