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HelpTest Code CORT SUPP Cortisol Supression
Additional Codes
LAB13394
Performing Laboratory
Central Peninsula Hospital
Collection Method
Venipuncture
Container
Lt Green / Plasma Separator / Lithium Heparin
Specimen Type
Preferred
- Plasma- Light Green Top (Lithium heparin)
Acceptable
- Serum- Gold Top SST or Red Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 24 hours |
| Refrigerated (4°C to 8°C) | 4 days |
| Frozen(-40°C to 0°C) | 12 months |
Reference or Target Ranges
| Cortisol Suppression |
<2 ug/dL Comment |
Comment:
Single-dose Dexamethasone Suppression Test (AM Cortisol) Result Interpretation:
• Under 2.0: Normal
• Between 2.0 and 10.0: Unclear -may need more testing
• Above 10.0: Suggests Cushing's syndrome
False positives may occur with estrogen use, obesity, poor sleep, or acute stress.
Reportable Units
µg/dL
Critical Value
Not defined for this assay
Reasons for Rejection
| Hemolysis Threshold | 500 mg/dL |
| Icterus Threshold | 25 mg/dL |
| Lipemia Threshold | 1500 mg/dL |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
82533
Last review/edit date
2025