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You are correct about the bicycling, masturbating, etc., prior to the PSA blood draw.
Basically, the preparation for a PSA test includes the following:
IN THE 48-72 HOURS BEFORE THE TEST:
* Do NOT have any kind of sex
* Do NOT ride a bike
* Do NOT perform any strenuous exercise
* Do NOT have a digital rectal exam performed
All of the above activities can put stress/excitement on the prostate and, as a result, trigger a falsely high PSA reading.