They are depending upon “imaging” (X-rays, ultrasound, CT scans, NMR, etc.) for the diagnoses, not actual biopsies.
I went to the emergency room once and they took a chest X-ray and the affirmative action intern was positive I had lung cancer. Turned out the “shadows” she used for her diagnosis were scars from the histoplasmosis I had as a kid that I caught from cleaning out my pigeon coop.
That’s where a little knowledge is dangerous. Oh, that’s cancer... whoa not so fast. That’s why blood tests, biopsies, etc. are mandatory.