Last year the Government decided to change the bulk billing scheme for blood tests when they were ordered by a specialist Doctor, so instead of not paying when you had the blood test done, they send you an invoice for payment. If you have tests ordered by a GP then they are still bulk billed, it is only tests from specialists, unless they are part of an ongoing series of tests. I see a dermatologist and I have to have monthly blood tests because of the meds I was on and lucky for me the pathology place knew that they were on going tests so I didn't have to pay, but the few times they forgot to put that on there, I was invoiced for $155!. You can then take that to medicare and have them pay their bit and then you only pay the gap, but it is still bugger all. So I would be guesing that an Ob would be classed as a specialist Doctor.