Re: That's how the test works...
The pituitary is right there also. That is how they surgically remove a pituitary tumor - through your nose.
I've had sinus surgery twice. the first just used a local anesthetic, and I watched the ENT doctor pull crap out of my sinus through my nose, which was then packed with bandages. Not pleasant at all, but better than the second time when they completely put me under, and I had to rinse my nose and sinuses for several weeks afterwards.
Based on my experiences, I'm hoping to avoid a COVID-19 nasal swab!