Thank you! I didn't know that. This is useful information.
Yes, for sure, avoid biotin that is found in many common vitamin/mineral pills. Here is what LabCorp documents for its 140731 uPSA test:
"This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about
biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample."
As to your original question about
psa value moving back and forth between .1 and <.1, here is the deal with my uro and me. He uses a standard PSA test that *only* shows values as <.1, .1, .2, .3 etc. For any "true" blood value of <.05, the report for the test shows "< .1". For any true blood value .05 through .149, the report shows ".1". For .150 through .249, it reports ".2". and so forth. Odd, and irritates me no end. But he uses his test, and I get my own uPSA test from LabCorp and just don't tell him unless it comes up in a visit.
So my own early Dec. uPSA showed .048, and a week later, my true psa was probably .051 or so, and uro's standard test reported ".1". I went off my testosterone shots the next week (my own accord) and my own monthly uPSA tests since have been mid .030s or about
. So my standard test for him this Fri. before my appt. following Fri. will almost surely report out as "< .1".
Maybe your doc uses a similar (imho useless) standard PSA test. So you see how easy it is to jump back and forth across the reporting values for some standard PSA tests. I just will never agree with the medical profession's penchant for hiding important information from the patient. Because we can't handle the truth? -- (sorry, Jack Nicholson).
Hope this helps.
Jan '08-'11 PSAs 2.2 2.5 2.7 2.6, DREs-
Jan '12: PSA 3.6, DRE+
Jan '12: MRI inconclusive
Feb '12: PCaDx pT2a, 4/12+ (3 @ 3+3, 1 @ 4+3); 3% tot cores; bone scan-
Apr '12: RALP; 3+4=7; pT2c pN0 pMx; 30%; 3mm r lat margin of 3+3=6 so pT2+; EPE-; PNI+; 8 LN-; SV-
TRT 03/'14- uPSAs: <.015 til 02/17; mostly .020-.030 then .048 on 12/1/18; off TRT since 12/2018 and uPSA settling in mid .030s