Medical for a Z visa

I will be going back to teach in China. The first time I went a couple years ago I was required to have a medical done here in Canada to go along with my Visa application. At that time my boss in China wrote a letter to the consulate asking me not to have one, as they won't recognize it over in China and I had to have another one done once I got there anyways. I can see the pdf file for the physical on many websites, but no info anywhere as to whether or not I actually have to do one here in BC before I leave or apply for the Visa. I'm currently just waiting for the invitation letter in the mail. Cheers and thankyou!