Hi, Sorry it took so long for me to get back to you. I've been very busy. I am going to have to ask my vet what kind of blood test they call it but it is very extensive. It takes place over a 2 day period. The first day the vet draws about 5 viles of blood( do not remember exact number now) then injects Marvin with azium. He comes back with 24 hours and draws 4 more viles of blood. This is then sent off to the MSU approved lab for testing. So Far the Permax dosage seems to be working very well. The only draw back with being in the research project is that you have to purchase the drugs from an authorized pharmacy. I guess for quality control reasons. The vets in the study seem to think Marvin is fine for now with out any thyroid meds. The blood work is done every six months, and my vets office calls to schedule the appt. As for the founder episodes they took place about 2 years apart. Both before I found a vet willing to do proper testing for cushings. Marvin was only depressed for a while last winter. He then had abscecces going in both front feet at the same time. He still had shoes and pads on at this time as well. He would hardly eat and refused to leave his stall even though he had 24/7 acess to a large pasture with the 2 other horses I have here. to be continued...