Dexamethasone Suppression (Cushings) (DEXA SUP CS)
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| Synonyms:
| None listed |
| Specimen: | Blood; (1) SST (serum separator) or Red (no preservative) top vacutainer tube. On Day 1, patient has cortisol levels drawn at 0800 and 1600.
A 1 mg dose of dexamethasone is administered at 2300 on Day 1.
On Day 2 An additional cortisol level is drawn at 0800. |
| Volume: | Full primary tube |
| Minimum Volume: | 200 microL serum |
| Collection: | Outpatients must be scheduled through First Call at (864)512-2255.
To schedule Inpatients, call extension 1377.
If tube other than an SST (serum separator) is collected, transfer serum to a tightly capped plastic aliquot tube within 2 hours of collection for transport.
Refrigerate at 2-8°C for 7 days.
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| Rejection Criteria: | improper labeling |
| Reference Range: | After the administration of 1 mg of dexamethasone at 11 pm, normal individuals will typically have a cortisol level of less than 5 mcg/dL at 8 am the following morning. In the presence of Cushings, the cortisol level is greater than 10 mcg/dL. While thi |
| Methodology: | |
| Test Use: | Tool used for diagnosing Cushings Syndrome. |
| Additional Information: | |
| Testing Includes: | Day 1: 0800 and 1600 Cortisol; 1 mg Dexamethasone is given at 2300.
Day 2: 0800 Cortisol. |
| Testing Facility: | AnMed Laboratory |