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HelpTest Code DEXA Dexamethasone, Serum
Ordering Guidance
For synthetic glucocorticoid analyte screen, order SGSS / Synthetic Glucocorticoid Screen, Serum.
Specimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL serum
Collection Instructions:
1. Draw blood between 7:30 a.m. and 9:00 a.m. the morning following an evening dose.
2. Within 2 hours of collection, centrifuge and aliquot serum into a plastic vial and freeze immediately. Do not send in original tube.
3. Send frozen.
Specimen Type
SerumSpecimen Minimum Volume
Serum: 0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Frozen (preferred) | 28 days |
| Refrigerated | 14 days | |
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Reference Values
Baseline: <30 ng/dL
8:00 a.m. following 1 mg Dexamethasone, previous evening: >100 ng/dL
8:00 a.m. following 8 mg Dexamethasone, (4 x 2 mg doses) previous day: >800 ng/dL
Day(s) Performed
Tuesday, Thursday
Report Available
2 to 10 daysSpecimen Retention Time
3 monthsPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80299