Question

A 56-year-old woman with suspected Cushing's syndrome has an abnormal low-dose dexamethasone suppression test. Which investigation helps differentiate the cause?

Accepted Answer

High-dose dexamethasone test or plasma ACTH measurement

Answer

Plasma aldosterone/renin ratio

Answer

24-hour urinary metanephrines

Answer

MRI head immediately

Answer

Serum growth hormone

Practice question

A 56-year-old woman with suspected Cushing's syndrome has an abnormal low-dose dexamethasone suppression test. Which investigation helps differentiate the cause?