PSA doubling calculator. If your PSA is rising, it can be risk-stratified by calculating a logarithmic doubling time. The longer the doubling time, the slower growing the cancer.
If the doubling time is over 9 months, this is considered very favorable.
If the doubling time is less than 3 months, this is very concerning.
The link is an easy calculator to use from a prostate cancer support group in Cincinnati.
