I had bloods done for HcG a while ago (I was freaked, as despite ttc, I was late with a neg pg test and very worried about another ectopic). I rang the clinic to be told they couldn't give results and the dr wanted to see me. I was pretty much having anxiety attacks.
When I went to the appointment the dr said the bloods were neg she said she liked to have follow up appointments for all pathology.
In short, it's about making more money from you with another consultation imo. With both my son and daughter, they gave me results over the phone. They didn't and couldn't give levels, but said yes you are pg.