You could print this forms from the website. But what I know the or think the GP or doctors who represents the canadian immigration in doing medical tests will always have your name i dont know how it works but it will be pointless for them to do medical results for you without you having the forms. Please wait for the forms, if you are expecting the forms soon you can always book appointment in advance as sometimes its very hard to get an appointment especially here in london where you have to wait.