Great link on the pheo, do you know if this test is referring to the plasma free blood test or another blood test?

For diagnosis of pheochromocytoma:
◦fMN - Se 62.5%, Sp 97.3%
◦fNMN – Se 100%, Sp 97.6%
◦Canine reference ranges!

•Adrenocortical tumors synthesize and secrete inhibin
•Serum [inhibin]: Se 100%, Sp 88.9%, accuracy 93.6% for identifying adrenal tumor as a pheochromocytoma
•Undetectable inhibin is highly supportive of pheochromocytoma in neutered dogs with adrenal tumor