PSA testing soon after DRE, sex, bike riding?

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Regular Member

Date Joined May 2010
Total Posts : 264
   Posted 6/17/2011 9:17 AM (GMT -6)   
Are there any studies that show the difference it makes if you get a DRE just prior to blood being drawn for a PSA compared to drawing the blood with no activity that might stimulate the prostate?

It seems to be common knowledge that jostling the prostate can cause a rise in PSA but I am wondering if it has been quantified.

Age: 55
My PSA rose from 3.2 to 5.1 over 1.5 years with Free PSA at 25% for the last two tests.
DRE showed no irregularities other than being a little large.
PCa diagnosed 4/6/10 after biopsy
1 out of 12 biopsy samples was positive with 5% of biopsy sample cancerous
Gleason 3+4
Davinci surgery 6/1/10 -- post op Gleason 3+3
Latest PSA (April 2011) <.1
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Veteran Member

Date Joined Sep 2009
Total Posts : 3172
   Posted 6/17/2011 9:36 AM (GMT -6)   
Yes, it's been shown to be highly variable. How much bike riding, how much prostate massage, etc would make each case different. For this reason, docs will typically err on the conservative side and tell you to avoid these things for days.

Dan Zenka
Regular Member

Date Joined Mar 2011
Total Posts : 44
   Posted 6/17/2011 12:03 PM (GMT -6)   
I have not seen any studies quantifying the DRE as a cause of elevated PSA readings. I would imaging that the short duration and slight palapation (probably similar in magnitude to a passing bowel movement) would not effect the prostate like prolonged strenuous physical activity prior to a PSA test.
I have run into ohysicians and patients who have seen false rises due to such strenuous activity prior to screening, so it is perhaps best to rest prior to your annual screening.
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