Can creatinine levels go up and down?

Yes, creatinine levels can go up and down. Creatinine is a waste product that is produced by the muscles and is excreted by the kidneys. Creatinine levels can increase or decrease depending on a number of factors, including:

* Muscle mass: Creatinine is produced by the muscles, so people with more muscle mass will have higher creatinine levels.

* Kidney function: Creatinine is excreted by the kidneys, so people with kidney disease will have higher creatinine levels.

* Diet: Eating a diet that is high in protein can increase creatinine levels.

* Dehydration: Dehydration can increase creatinine levels.

* Certain medications: Some medications, such as cimetidine and trimethoprim, can increase creatinine levels.

If you have any concerns about your creatinine levels, talk to your doctor.