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[–] ammonthenephite 0 points 2 points (+2|-0) ago 

Assuming a legit test, you want as concentrated a sample as you can get to ensure detection. You also want as limited outside contamination as possible as well, so simply blowing on it while outside the body would open you up to potential outside contamination and decrease confidence that a positive result came from the person you were testing.

This of course assumes a legit test for a legit virus.