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I haven't yet applied for the visa. How will I know if the CIC has approved my medicals?

What are you applying for?

Is your spouse or another family member sponsoring you for PR?
 
I haven't yet applied for the visa. How will I know if the CIC has approved my medicals?
In general family sponsorship takes a while and they don't suggest anyone to do up front medical. By the time the PA is ready to travel their medical would be expired already.
Well, but you are not applying under family sponsorship anyway.