@topf Oh, that may be good news for you. I once did a normal PSA test (Quest) and an ultra sensitive PSA test (Labcorp) on the same day (back-to-back blood draws at adjacent facilities). Quest yielded 0.11 and Labcorp yielded 0.097. Close, but not the same. My experience has been that at low values (around 0.1 or less), small PSA variations are normal, and can cause a lot of alarm that usually proves to be clinically insignificant “psa anxiety”.

Footnote: for ten years after my prostectomy, my doc only did normal PSA tests. Results always came back as undetectable (<0.1) until June 2025 when my PSA hit 0.11. I was a happy camper for those ten years and never gave things a second thought. If I had been doing usPSA tests for those ten years, I may well have been one rolling ball of PSA anxiety. I’m glad I had those ten “carefree” years, but I’m also glad I stayed on top of my PSA and caught the relapse at “first light”.