Creatinine is a chemical waste product in the blood that is filtered out by the kidneys. Again the creatinine blood test is an indicator of kidney function. That includes severe kidney infection as well as acute and chronic disease. High creatinine can also occur in injury and diabetes. This can also indicate serious dehydration.

Low creatinine is usually not significant, but can indicate muscle mass loss.


Zilla's creatinine was in the normal range, so there were no diagnostic clues in that test. It does indicate however that most likely her kidneys were filtering waste products properly at that time.