It depends on the type of test--the ultra sensitive PSA test goes down to .01 or lower--- I was told .04 and below is considered undectable. Some docs/labs use a less sensitive test that goes down only to .1 --- so you dad's reading would be undectable if that test wre used--- ask the doc's office which one they're using. Even if its the ultra-sensitive, .1 is not neccessarily a recurrence at you dad's stage of the game---hope this helps---GODD LUCK!
Open Radical Prostatectomy 6/9/2006
Pathological Stage T3a, Positive Surgical Margin
PSA rose to .24 in November of 2006
6 month hormone therapy initiated December 1. 2006
36 sessions of IMRT Ended Feb 1, 2007
PSA as of May 25, 2007 undetectable
Next PSA November, 2007