I realize this is a bit different but I would appreciate your opinions.
My cat is hyperthyridic! I give her Methimazole (that's similar to Carbimazole) twice a day, and have taken her to the vet every month for a blood test to get her dose right - pretty much what we humans have to do. When I took my cat last month I was chastised for giving her a pill that morning, I was told to go away for 6 hours and return to collect her - I did that. So this morning I took her for her monthly blood test and when asked when did she last take her pill, I said, last night. "OH NO!" said the vet, a different one this time, "We need to take the blood four hours after the pill". So, here I am sitting waiting for the phone again, my day completely taken up because I live a long way away from the vet - and waiting to collect my cat.
So, what are the rules exactly, does any one know? It looks as if Methimazole doesn't hang around in the system like T4 does. Shouldn't my cats system be empty of medication to measure what is going on when no meds are present?