How to calculate PSA velocity ???

hello again

I was reading on the John Hopkins about PSA velocity, But, I'm not certain how to calculate it. they indicated long term velocity can be used as a tool to predict % chance of survival.

copy and paste from John Hopkins

PSA velocity is a measurement that takes into account annual changes in PSA values, which rise more rapidly in men with prostate cancer than in men without prostate cancer. A study from Johns Hopkins and the National Institute on Aging found that an increase in PSA level of more than 0.75 ng/mL per year was an early predictor of prostate cancer in men with PSA levels between 4 ng/mL and 10 ng/mL.

PSA velocity is especially helpful in detecting early cancer in men with mildly elevated PSA levels and a normal digital rectal exam. It is most useful in predicting the presence of cancer when changes in PSA are evaluated over at least one to two years. In a study reported in The New England Journal of Medicine, a rapid rise in PSA level (more than 2 ng/mL) in the year before prostate cancer diagnosis and surgical treatment predicted a higher likelihood that a man would die of his cancer over the next seven years.

Moreover, a Johns Hopkins study published in the Journal of the National Cancer Institute found that a man's PSA velocity 10 to 15 years before he was diagnosed with prostate cancer predicted his survival from the disease 25 years later. In the study, 92% of men with an earlier PSA velocity of 0.35 ng/mL or less per year had survived, compared with 54% of men whose PSA velocity was greater than 0.35 ng/mL. 

here are the PSA tests

2000  .57

2003  .59

2009  3.50

2011  4.80

what is my PSA velocity ?

I have talked about this subject many times here, every since I have been at HW. I am a big believer in the danger of extreme PSA velocity before diagnosis. My PC journey has been a text book perfect example of how this thinking can work in practice.

My PSA went up by 6.5 whole points in the year before diagnosis, without any evidence of infection. Then it went up another full 4 points in just the next 2 months before surgery. As a result, my surgery failed within 9 months, and then after going through SRT, it failed again in less than 9 months. My PSA has been skyrocketing ever since.

In that thinking, some say that you can die of PC as much as ten times more likely, regardless of any primary or secondary treatments.

My oncologist feels I am dealing with a very aggressive variant, and that stopping it or even slowing it down much is likely.

Fortunately for many men with PC, they are not dealing with situations like this, and I am glad.

David in SC