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@sand
I've absolutely no idea how the system works in Canada but doing that for a UK NHS blood test form would result in the sample(s) arriving at the laboratory and them being unable to process it because the tests needed would be encoded / linked to the QR code.

The QR code links •in my experience• expire after a finite time (for reasons unclear to me) so unless the tests are written in plain text, they can't be done.

In your situation •here• the request for the tests - if a paper form is needed at all - would be posted to the patient a week or two before the tests are due. This is the system for my wife's regular Haematology monitoring, and how we used to do it when I worked in pathology.

(Increasingly the NHS is doing away with paper forms and just printing QR codes onto the bottles at the point of phlebotomy)