Also the medical examiner will give you a copy of the Medical Report Section A stamped with the date the medicals were performed. You could use your copy as proof that the examinations were completed within the timeframe CIC requires.
I got the copy the first time i did the medicals back in 2010, but this is the 2nd time as they expired, this time i didnt get anything BUT the receipt of payment, that was it, next day she called me to let me know i needed to redo the urine test.
I emailed embassy to let them know about this, and to know if this would affect the 60 days time frame they gave me but they havent replied yet :S