Mine was less the two weeks after surgery. I wasted no time in retaining an oncologist and he started them right away. There should definately be a drop Here's my history:
October 3, 2006 19.8 (1st PSA)
October 10, 2006 18.9
November 27, 2006 13.9 (Dx via biopsy)
Surgery February 16, 2007
February 28, 2007 0.9 (via Oncologist)
March 12, 2007 0.1
March 23, 2007 <0.1 (first undetectable) NADIR
May 16, 2007 <0.1
July 18, 2007 <0.1
September 19, 2007 <0.1
January 29, 2008 <0.1
Next test : May 13, 2008
Tony