How do they help you identify what might be going on?
How would you hypothesize her use of dexamethasone impacted her hypothalamic pituitary adrenal function and physical condition?
Illustrate your hypothesis in a diagram.
First answer offered: high MR would increase Na resorption and K secretion in the collecting duct.
Check renin if high think reninoma or RAS; if low check aldo
If Aldo is high: think primary hyperaldo; if low think pseudohyperaldo