That’s easy. PSA has a half life of nearly 3 days. So, say your PSA was 6.0 on the day of your prostatectomy, 30 days would be 10 doubling times. That’s 2E10, 1024. 6/1024 is 0.00586< 0.03. Undetectable if the prostatectomy worked.

So, after 30 days, just divide your pre-prostatectomy by about 1000. You really don’t have to wait for 5 weeks.

Lou