As per my understanding they have designated Medical Institutions or Hospitals from where you need to get your medical tests done and if you will go there and tell them that you want medical tests done for Canada immigration they will take care of it.. and they will give the report..and then its VO that needs to determine if the report is OK to give PR.. so don't bother about that thing which is not in your hand.. Start eating Apple
to keep Doctors away if you use to visit them so often .. And also follow the new wordings of Helath Minister of India...