Propecia and PSA Testing

I am on Propecia and I want to get my unmedicated PSA level. How long will I have to be off this medication to get the unmedicated level?

I checked with a urologist and he tells me that he believes that the magic number is 3 months. I am not sure of the reasoning here because the half life is less than 5 hours. But I guess that supression of the PSA blood level may take longer than the half life, which is another measurement. The urologist thinks that the PSA may relate to prostate volume in those with enlarged protates(which can be “permanently” shrunk with finasteride). I hope that this makes sense. Some feel that finasteride may shrink the PSA levels 40% or so.

PSA is a test used for Cancer of the Prostate. Elevations in thie PSA may indicate Prostate cancer and a person should be evaluated by a urologist it this value is elevated.