Rapid tests are not the achievements of the modern age: they already existed thousands of years ago.
There were always questions that we wanted to be answered as quickly as possible, for example, whether we are expecting a baby or not. And innovation has begun.
In ancient Egypt, wheat and barley were used as a rapid pregnancy test: women urinated on seeds. If the plant started to grow, it meant a baby was on her/his way. The principle of the test is the estrogens stimulation effect, and it works surprisingly well, correctly identifying 70-85% of pregnancies. This test takes a couple of days, but in ancient times it was a really rapid test.