On call: Measuring the PSA Is fasting necessary?
Over the years, researchers have investigated other things that may affect PSA results. A doctor's digital rectal exam will not alter blood PSA levels, nor will riding a bicycle. On the other hand, ejaculation may temporarily boost the PSA, so if your reading is high, it may be wise to repeat it after 48 hours of abstinence. Urinary tract infections can send the PSA soaring, as can prostate biopsies and other procedures involving the lower urinary tract.
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