At what PSA do you start calculating doubling time post-prostatectomy?
With ultra-sensitive PSA, it's unclear to me whether a doubling from 0.01 to 0.02 or 0.02 to 0.04 is significant. Is there a certain value that you would start calcuating doubling time from?
Answer from: Radiation Oncologist at Academic Institution
The problem you describe, I think, also applies to standard assays when values are at or near the limits of detectability. Is an increase from 0.1 to 0.2 in 3 months really indicative of a rapid rise? If you are seeing small changes at low PSA values, and you're not inclined to treat the patient, yo...
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