I need to draw my own blood. Many hospitals and some medical and health institutions can apply for health certificates, but they can't do it on their behalf.
It is illegal for some scalpers to sell health certificates, because that certificate is fake, and it is illegal to use fake certificates. Certificates obtained without formal inspection and formalities will not be recognized, in case the owner of a fake certificate suffers from a certain disease and spreads it to others while engaged in related occupations.