Re: sex and psa levals
Here's a posting on this board from 2007 that has some good referenced information; review this:
The natural stimulation of the prostate gland during sexual activity increases the amount of PSA in the blood stream above the individual's "normal" level, but after sex the temporary incremental amount of PSA gradually diminishes over time until the individual's "normal" level is re-estabilshed. No two people's bodies are exactly the same, so (i) the incremental increase in PSA during sexual activity, and (ii) the duration of time needed to diminish the incremental amount after sex, will vary. The general rule of thumb appears to consistently be to abstain from sex at least 48 hours before PSA testing---this was what my doctor told me to do, and what I have read repeatedly.
Also, note (in reference to the posting immediately below) that the "goal" of a man with a prostate—even a non-cancerous prostate—will not be zero. A normally functioning prostate will produce a nominal level of PSA measured in the blood stream. Cancer cells in the prostate produce PSA at roughly 20X the rate of non-cancerous prostate cells.