What is my PSADT?

[hwrjr]

My PSA on Jan 26 was 3.28 My urologist put me on antibiotic for 30 days and I retested yesterday at 3.66. I'm using the MSK PSADT calculator and doubling time varies depending on length of history I input. Most articles on PSADT say not to use real long histories, like 10 years for example, but rather maybe 3-5 years. If I use 3 years for 2021, 2022, 2024 (I didnt test in 2023): 1.02, 1.19, 3.28, I get doubling time of 20.5 months. I think the 24 month spread between 2022 and 2024 may be a problem and giving me longer doubling time. I wanted to see what it would be if I estimated a number for Jan 2023. If I assume on Jan 2023 I had a score of 1.40 which would be a linear increase similar to the years 20, 21, and 22, and I drop 2021, then the doubling time is 16.4. I'm not using the number from yesterday because many articles say not to use intervals of less than 3 months as it's just statistical noise.

Is MSK still a reliable calculator for doubling time?

[Tall_Allen]

You have reason to suspect that prostatitis is skewing your PSA, so it is meaningless.

[Justfor_]

" .... many articles say not to use intervals of less than 3 months as it's just statistical noise."

Silliness unlimited!

The exact opposite is true. Oversampling reduces measurement noise.

[conbio]

Just a note. This is how my PC was detected. I had a UTI and my PSA would not go down. So off to a MRI

[groundhogy]

I had similar data. I never experienced in my life a sharp PSA increase due to prostatitis. It was PCa for me as I had suspected. Has the character of your prostate changed?

They kept fending me off. But when i got the chance for biopsy, i chose saturation biopsy. 1 needle per cc. They found it after the doc was adamant and 99% sure i was cancer free.