Google Answers Logo
View Question
Q: what conditions can alter the PSA test? ( Answered,   2 Comments )
Subject: what conditions can alter the PSA test?
Category: Health
Asked by: discus170-ga
List Price: $10.00
Posted: 26 Aug 2006 14:03 PDT
Expires: 25 Sep 2006 14:03 PDT
Question ID: 759783
Can sex,especially the day of the PSA test, and bike riding raise the
test score numbers?
Subject: Re: what conditions can alter the PSA test?
Answered By: sublime1-ga on 26 Aug 2006 16:35 PDT

According to this article on, the activities
you named can raise the numbers:

"...other events may, and do, influence the PSA level in the blood.
 Ejaculation, bike riding, or any manipulation of the prostate, such
 as a DRE [digital rectal exam], all have the tendency to raise the
 PSA in the blood. Furthermore, there are theories that the time of
 day a sample is drawn and the day within a 28 day cycle may affect
 the PSA level. Also, inflammation of the prostate (prostatitis) is
 also a frequent source of raised PSA."

More on the page:

Since a DRE is part of a routine prostate exam, you should be
assertive and insist that it be done AFTER the PSA test.

The test is best used to discover significant increases of the 
levels from past results. A very good page on the pros and cons
surrounding the test's utility is found on the National Cancer
Institute's site. There is considerable controversy over the
value of the test versus the anxiety and the frequently unnecessary
follow up procedures which can result. Facts such as the following
should be considered:

"Most men with an elevated PSA test turn out not to have cancer;
 only 25 to 30 percent of men who have a biopsy due to elevated
 PSA levels actually have prostate cancer."

Much more on the page:

A much more detailed and scientific article on prostate cancer
detection, PSA testing and more is found on the Life Extension
site, written by Dr. Strum:

Use Ctrl-F to search the page for "ejaculation", without
quotes, and it will take you halfway down the page to a
pertinent discussion with illustrative tables, which leads
into a discussion of the effect of such activities as bike
or motorcycle riding, horseback riding, etc.

Additional information may be found from further exploration
of the links provided above, as well as those resulting from
the Google searches outlined below.


Searches done, via Google:

PSA test

"PSA test" "bike riding" sex
Subject: Re: what conditions can alter the PSA test?
From: markvmd-ga on 27 Aug 2006 09:37 PDT
Sex AND a bike ride on the same day? You stud muffin!
Subject: Re: what conditions can alter the PSA test?
From: mgnairtvm-ga on 30 Aug 2006 21:14 PDT
What abnormal results of PSA mean     
Greater-than-normal levels may indicate:
Benign prostatic hypertrophy 
Prostate cancer 
Prostate infarction 
Urinary tract infection 
Recent urinary catheterization 
Recent urinary tract operation 
prostate cancer can also be present in the complete absence of an
elevated PSA level, in which case the test result would be a false
negative. PSA levels can be also elevated due to prostate infection,
irritation, benign prostatic hypertrophy (enlargement) or hyperplasia
(BPH), recent ejaculation, digital rectal exam etc., in which case it
may give a false positive.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  

Google Home - Answers FAQ - Terms of Service - Privacy Policy