Golfnut, we need a mathematics expert to put it into context, I have been trying for years to come up with a comparison. I had a blood form from, my oncologist and a blood form from my GP for some routine tests a few weeks ago. They both had PSA tests requested, I went to our regional health centre the nurse to several vials of blood, a PSA blood same went in each envelope and went to the same lab, one came back as 0.04 the other as 0.05. 0.01 could be the unreliability of my blood, or lots of other variable factors with the equipment. The nanogram is such a small measurement I don't don't know how they manage to even detect.
I have been on this journey for eleven years and soon realised that worrying about blood tests dies not affect the results, so I don't worry, I do like to know where the results are headed.
Best wishes for your future recovery, I have frequently seen it said that for a man without a prostate, sexual activity or riding a bike will not make a difference. There is alot or research about how long the PSA stays elevated after sex and cycling for a man with a prostate, some suggest as little as 40 minutes.
Thanks Chris