I would not be real hard on your vet. There are lots of breeders who have no idea how to test for TH and PHA yet. Just yesterday, I visited a herd with some well known bloodlines and some pretty good cattle, and they did not know how to test or where to send the samples. I have been asked this question twice in the past two weeks by breeders who have been in the business for many years.
In regards to vets, I sometimes wonder if they just skip over some pretty basic stuff when they are in vet college, thinking that they will gather the knowledge once they are working in the field.I took one of my donors to the vet to be infused as she had a minor uterine infection. There were three vets in the clinic, and none of them had any idea how to do this. The only reason I took her to the vet was that I had a waiting list of people wanting to purchase embryos, and I wanted to be sure she was infused properly in each uterine horn. Needless to say, I infused her myself, in the vets chute, and then they charged me for the use of the clinic. I should have sent them an invoice for providing them with knowledge.