@amoore67, welcome. I'm bringing in other members like @gingerw @sameeh123 @mauraacro @maxwell123 into the discussion who may have experiences to share about rising creatinine levels post donation.

Given that you donated your kidney eight years ago, this doesn't seem like it is directly related to donation per se. But having only one kidney, it is certainly not to be ignored. Have you discussed the lab results with your doctor or nephrologist?

My opinion- not medical advice, is that you have a new normal after donating.
1.44 could be considered high for a 25 year old healthy person with 2 kidneys but average for a 50 year old with 1. It seems like comparing apples to oranges.
That being said, if it concerns you at all, ask for help from the place you donated.
My Dr tends to blame any variance of my lab numbers on having donated, even when they are within normal range and is sure having 1 kidney will " catch up" with me at some point, even though there is no indication of any health problems in the past 5 years . Gosh he's terrible, I really need a better Dr.
Anyway, even though Mayo doesn't cover my labs after the 2 year mark, they said I could always call with questions and if I ever had problems with kidney to let them know so it sounds like they would always be available for donors.