Exercise like bike riding, running, weight lifting just before a PSA test can cause a temporary slight upwards movement. Ejaculation can have the same effect. No urinary issues? Or he could have a case of Prostatitis although that usually causes discomfort. Has he had blood tests other than PSA testing? Good luck it's more than likely not a cause for concern but absolutely follow up. If his father has or had prostate cancer it raises a red flag even at the young age of 30. Just don't ignore it.
It's a little early to be concerned at 30yo, but PSA tests are cheap and available so why not test annually and baseline it? That way you'll know the PSA velocity and be more informed if there is a risk in the future. At 45yo my PSA was 1.3, at 55yo it had risen to 3.3, then eight years later at 64yo it was 23 and I was stage t3bN1M0 + SV +LN. I should have caught it earlier, but in the early 2010's, the US Task Force on Cancer Prevention was recommending AGAINST PSA screening, and my GP discouraged it. I checked it on my own using an online lab and found out the bad news. It's better to know, than not know.
Thirty years old and a PSA of 1.8 is not concerning, but like I said above, if he is concerned, go ahead and start baseline testing and see what the velocity is. ACA guidelines for highest risk is to start screening at age 40. PCa at 30yo would be very rare. How many people have you heard of have been diagnosed at 30?amp.cancer.org/cancer/prost...
Elevated PSA at that age is almost always due to benign causes, like urinary retention, BPH, prostatitis, sex or bike riding within 2 days, or Covid-19. His urologist should rule those out first.
I strongly recommend that you seek genetic counseling through your system.After interview it is likely that you will be approved for genetic testing. Blood test.
You may learn that you have inherited certain mutated genes. BRCA1 or BRCA2 for example. If so at some point you will qualify for certain treatment options unavailable to others.
This would mean that you and your bloodline are far more susceptible to certain cancers. I've had 4 different types and am more cognizant of such problems and faster treatment.
Something to discuss with your MO. After failing both Lupron and Xtandi I am on Lynparza/Olaparib for last 4 mos and it helping quite a bit. MY use by date was 2018 with a Dx of stage 4 and PSA 1303. I'm still here with my family chugging along.
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