Depends if they use e-medical or not. One doctor in Toronto that used e-medical required: passport, passport sized photo, express entry profile number, $280 cash. Once it was completed they submitted everything electronically and they give you an up-front medical notification printout which you scan and upload once you get an ITA.
If the doctor paper files then 4 passport photos are required. Be sure to bring your prescription eye glasses if you require them.
In Toronto I recommend this guy: http://www.visadoctor.ca/canada