Dexamethasone Suppression Test (1 mg Overnight)
Overnight 1-mg dexamethasone suppression test (DST) interpretation.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Post-dexamethasone 8 am cortisol
- 3
Result: Post-dexamethasone cortisol 3 µg/dL (at or above 1.8 µg/dL): failure to suppress; confirm with further testing.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- < 1.8 µg/dL (50 nmol/L)
- Normal suppression; Cushing syndrome / autonomous cortisol secretion is unlikely.
- ≥ 1.8 µg/dL (50 nmol/L)
- Failure to suppress; consistent with possible Cushing syndrome or autonomous cortisol secretion — confirm (false positives are common).
What you enter
- Post-dexamethasone 8 am cortisol
- Unit
How this is calculated
Nieman LK, Biller BMK, Findling JW, et al. The diagnosis of Cushing's syndrome: an Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2008;93(5):1526-1540. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.