The UK-issue lateral flow tests have always said to swab the throat (specifically the tonsils) and then both nostrils at about 2.5cm depth.
Every time you sniff, you get nose mucous in your throat (what with them being connected and all), and when you sneeze quite a bit of throat mucous will is drawn up along with air. And now remember that your intestines are physically connected to your mouth by only a foot or two of squishy pipe and you'll be wishing for a nice clean robot body.
Follow the directions on the box. If it doesn’t say to swab your throat, maybe wait on that. Free styling on medical tests doesn’t always lead to repeatable results.
U.S. diplomats in China were subjected to anal swab tests for Covid-19, a Department of State spokesperson confirmed Thursday, adding that a protest had been lodged with the Chinese Ministry of Foreign Affairs.
So what's better, getting your throat spit up your nose, or getting your nose mucus in your throat?