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fludrocortisone suppression test
Indications:
- evaluation of hyperaldosteronism
Procedure:
- administer fludocortisone 0.5 mg orally every 6 hours for 4 days along with sodium & potassium supplementation
- measure serum cortisol at 7 AM & 10 AM & plasma aldosterone & plasma renin at 10 AM on day 4
Interpretation:
- test confirms hyperaldosteronism if
- plasma aldosterone > 6 ng/dL
- plasma renin < 1 ng/mL/hour
- serum cortisol at 10 AM lower than at 7 AM
Related
fludrocortisone (Florinef)
General
provocative clinical test
References
- Medical Knowledge Self Assessment Program (MKSAP) 17,
American College of Physicians, Philadelphia 2015
Components
aldosterone in serum/plasma
cortisol in serum
renin in plasma