If A Pregnancy Test Kit Can Detect Testicular Cancer, Why Aren't We Using Them?

This guy's decision to try out his girlfriends pregnancy test kit
probably saved his life. The test came back positive and, as the link
below describes, led several Reddit users to direct him to his doctor.
Apparently testicular cancer raises the same detectable changes in a
man as a pregnancy does in a woman.

Who knew?

Well apparently somebody did, which beggars the question: why has no
one been shouting about this so that we can get men using the things
on a regular basis? It's not like they're incredibly expensive.

Detecting new life and preventing loss of life? That'd be the humble
pregnancy test kit then...