@beachflyer
If you do not have an ultrasound sensitive test, you get one decimal point. If you get an ultra sensitive test, you get more than one decimal point, .02 is an ultra sensitive test. Could be they just don’t need to add more decimal points with this result.

The American Society of clinical Oncology has a completely different point of view about What you should do if your PSA rises after a prostatectomy. A lot of medical centers field the same way. Once PSA hits .2 After surgery,they recommend salvage radiation, They don’t wait for doubling rate, because early treatment results in long-term progression free survival.

From Ascopubs about what PSA to do salvage radiation.
≤0.2 ng/mL:
Starting at this level maximizes disease control and long-term survival. Patients treated at PSA < 0.2 ng/mL achieve higher rates of undetectable post-SRT PSA (56-70%) and improved 5-year progression-free survival (62.7-75%).
Delaying SRT beyond PSA ≥0.25 ng/mL increases mortality risk by ~50%.
0.2–0.5 ng/mL:
Still effective, particularly for patients with low-risk features (e.g., Gleason ≤7, slow PSA doubling time). The Journal of Clinical Oncology recommends SRT before PSA exceeds 0.25 ng/mL to preserve curative potential.
0.5–1.0 ng/mL:
Salvage radiation remains beneficial but may require combining with androgen deprivation therapy (ADT) for higher-risk cases.

This article discusses the above;
https://ascopost.com/news/march-2023/psa-level-at-time-of-salvage-radiation-therapy-after-radical-prostatectomy-and-risk-of-all-cause-mortality/
.