By the term "mask", the rule of thumb that I was exposed to was that if you're on flomax or any of the other BPH drugs or supplements, your PSA will be approximately 50% of what it would be without it. So, if you're on one of these meds, if your PSA comes back at 4, double it.
I've heard/read of that using PSA doubling 'rule of thumb' if you're on finasteride or avodart but not for flomax/tamsulosin and the other alpha blocker drugs, which leads me to question my post treatment PSA results because I'm still taking tamsulosin daily.
Age 60, 58@Dx
PreBx PSAs: 8/19/16 - 71.4, 10/03/16 - 87.3
Bx: 10/12/2016, T1C, 31cc, 3 of 14 G7(4+3)
11/16 bone scan - no mets
Tx: 2/15/2017 - 4/17/2017, 44 IMRT, Whole Pelvis 45 Gy, Prostate Boost 34.2 Gy, total 79.2 Gy
ADT(Lupron) 11/16 - 11/18 (last inj. 5/23/18)
PostTx PSAs: 8/17 - 12/18 <0.1