- Container
- 2 serum in red top or serum separators
- Component
- 2 Cortisol Assays
- Specimen
- 0.5 mL pre and post labelled serum
- Description
- This test measures cortisol concentrations before and after administration of exogenous dexamethasone (0 hours followed by an 8-hour sample). This is only a two cortisol assay. The low dose dexamethasone suppression test, a three cortisol sample test (mnemonic CDEX3), is preferred for diagnosing hyperadrenocorticism. The high-dose dexamethasone suppression test, a three cortisol sample test, is used to differentiate pituitary-dependent from adrenal tumor hyperadrenocorticism.
