The test itself is just like a pregnancy test, except that you do a 1/2"- 3/4"-deep nasal swab instead of peeing on it. The test shows the results right in front of you in 15 minutes. It's great if you just want to know for your own peace of mind, but by itself it is not sufficient for either EHAS or return to the US. The end result is a 2.5/"2.5" test kit with a 6" swab sticking out of the end, and 1 pink line for negative, 2 pink lines for positive. Test results are only valid between 15 and 30 minutes after taking the test. Each Kit contains two tests, to be taken 36-72 hours apart. Apparently, with Antigen testing, results are better with two tests taken 1.5 to 3 days apart.

I've heard that there are services that do tele-medicine monitoring of your self-test and provide documentation sufficient for travel, which is what bethandsteve must have done.