Oh Ann, i'm so sorry to hear about Wylie. I hope he just has hypothyroidism and not cushings.
How does his abdomen look and feel? is it bigger or harder?
Is he going to have an ultrasound done so they can measure his adrenal glands? i'm not sure if anything will show in a dog that is just being diagnosed or if it takes a while for a noticeable difference in size.
I think the vet is going to be doing an ACTH Stim blood test. It can be used to diagnose and to monitor cushings that is being delt with by medicating (and addisons which is the opposite of cushings). Its kinda like a bile acid test. Blood is taken as a "resting" sample, then a dose of ACTH is given according to the dogs weight. Two hours after the ACTH is given another blood sample is taken. This is sent out to the lab. I do not remember how long it takes for it to process, i'm sorry.
There is also a Low Dose Dexamethasone Suppression test they may possibly do. Since you mentioned he has to stay 8 hours i think this is what they may be doing. A pre test blood sample is taken. Then a dose of Dexamethasone is given. 4 and 8 hours later, more blood samples are taken. These are all sent to the lab and again, i'm sorry i do not remember how long these tests take to get back.
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