Post RALP tests <0.01 and now <0.03 - anything to worry about

My first post so be kind :)

RALP with full nerve spare in June 2023. Good recovery from op and now managing the side effects of incontinence and ED. Probably @ 80% for continence so will perservere with pelvic floor and have found a private physio to support me who specialises in this field

Had 2 PSA tests since op. September under the care of the consultant and test taken in hospital = <0.01

Second test taken December 2023 through GP and so at a different laboratory = <0.03

Initial reaction was very negative but the more I read it tells me that this is not necessarily an increase, just the results of 2 different laboratories testing with 2 different sets of equipment with 2 different levels of sensitivity.

My 3rd test will be through GP so will be able to judge the baseline versus <0.03

Am I right in my interpretation ?

thanks .......

Martin