iab,
you should email CEM. i do this every now and then to inquire to them eh.
RE-MANIL.IMMIGRATION @ international.gc.ca
ganito, gawa ako ng sample:
lagay mo sa subject ng email ito:
Application for a Canadian visa - BXXXXXXXXX
Dear Sir/Madam,
I have completed my medical exam as requested last MM/DD/YYYY.
Kindly advise if there are any other request I need to comply to or documentation I need to submit as needed by my application.
Thank you very much.
Lovingly yours,
Applicant (na napapraning na sa kakahintay ng kasunod na bagting mula sa langit

)
Sa ganyang format, at least naipapaalam/nareremind mo sa kanila yung date kung kelan ka nagpamedical (at makikita nila na ang tagal na hehehe). Hindi din masyadong demanding ang dating mo sa kanila na basta na lang humihingi ng update.
At yung pagtatanong kung may iba pang kailangan, at least irerevisit nila ang file mo to check ano na ang latest status.
Oks ba? ;D