This one is just about as fake as the PSA test for men (prostate).  They've proven it doesn't mean a thing to have a PSA test but the medical industry uses it anyway, because it's all they have and because it costs money and they need the money (more than YOU do, apparently). 

https://jonrappoport.wordpress.com/2018/04/04/the-gold-standard-of-medical-tests-is-fake/