Cushing's diagnosis.?

Question

My son was suspected of having Cushing's Disease. Since he is 3 1/2 and wets the bed, they gave him a low dose Dextramethesone Supression test , to see if he had it. It came out negative , so they said he doesn't. They are reconsidering, and want to do a 24 Urine for cortisol test.. what are the chances that if the other test was negative, this one might be positive? Should I prepare?

Answer 1

I personally have been fooled by the dexamethasone suppression test, and unless a boy of his age had a cather in for collection the possibility of an inadequate specimen is real.