Ultrasensitive PSA test

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Bootheel
Regular Member


Date Joined Oct 2007
Total Posts : 300
   Posted 2/15/2011 8:38 AM (GMT -6)   
I just had my 15 month post SRT PSA test yesterday.  It was <0.06.  The dr. told me it was basically 0.  He said that the lab could not measure any lower that that.  He also said that if it had been 0.06 he would suspect a recurrence.  I didn't realize that the little "less than" symbol (<) was that significant.  Any comments on thesubject would be appreciated. 
 

Purgatory
Elite Member


Date Joined Oct 2008
Total Posts : 25380
   Posted 2/15/2011 8:41 AM (GMT -6)   
bootheel, congratulations that is great. my doctors also feel, that a true post surgery reading of .05 or above, is an early indicator of recurrance.
Age: 58, 56 dx, PSA: 7/07 5.8, 10/08 16.3
3rd Biopsy: 9/08 7 of 7 Positive, 40-90%, Gleason 4+3
open RP: 11/08, on catheters for 101 days
Path Rpt: Gleason 3+4, pT2c, 42g, 20% cancer, 1 pos marg
Incont & ED: None
Post Surgery PSA: 2/09 .05,5/09 .1, 6/09 .11. 8/09 .16
Post SRT PSA: 1/10 .12, 4/8 .04, 8/6 .06 11/10 Not taking it
Latest: 6 Corr Surgeries to Bladder Neck, SP Catheter since 10/1/9, SRT 39 Sess/72 gy ended 11/09, 21 Catheters, Ileal Conduit Surgery 9/23/10

Bootheel
Regular Member


Date Joined Oct 2007
Total Posts : 300
   Posted 2/15/2011 9:18 AM (GMT -6)   
My PSA post Srt were .18, <0.04 (different lab), <0.06 (original lab)
Age 65
Diagnosed 10/12/07
PSA 6.3
Biopsy 18 core samples, 2 positive <5%
Stage T1a Gleason 6 (3+3)
LRP 1/29/08
Post-op
Gleason 7 (3+4)
1 positive margin (.3cm)
T2C
4/16/08- Started Bi-mix injections
5/15/08- 1st Post-Op PSA 0.07 Undetectable
8/11/08 -2nd Post-OP PSA 0.02 Undetectable
8/15/08- No more pads as of today Whoopee!!!
11/13/08- 3rd post-op PSA 0.02 Undetectable
03/02/09- 1 yr. post-op PSA .09 Undetectable
05/13/09 PSA .18 (ouch)
Started IMRT June 13, 2009
Completed 37 treatments July 31, 2009 (66.6gy)
11/23/09 Post IMRT PSA .18
2/12/10 Post IMRT PSA 0.00

142
Forum Moderator


Date Joined Jan 2010
Total Posts : 6949
   Posted 2/15/2011 9:42 AM (GMT -6)   
The "<" being present tells us that the equipment / test can not measure below that limit  - i.e. <0.06 is the lowest they can give you. When you got a <0.04, it was probably a different test or different test equipment.
 
Both mean "undetectable" in the context of the lab and test.
 
That is why we have so many running discussions about staying with the same lab, and checking the equipment used, if you can get that information.
 
Your <0.06 and <0.04 could in theory be for the same actual value - let's say your real PSA is 0.03. Both are correct to the limits of the test.
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