An increase from 2.75 four years ago to 6.5 today is a PSA doubling time of over 3 years.
So no need to be concerned about
velocity.
You can feed his PSA and actual dates into this tool
nomograms.mskcc.org/Prostate/PsaDoublingTime.aspxPSA DOUBLING TIME
Months
Doubling Time 38.7 months
Slope Log (PSA) 0.0
Velocity 0.1 ng/mL/mo
Years
Doubling Time 3.2 years
Slope Log (PSA) 0.2
Velocity 0.9 ng/mL/yr
BASED ON YOUR INFORMATION
PSA Date PSA Value
02/05/2011 2.75 ng/ml
02/05/2015 6.5 ng/ml