Can a cold or flu affect creatinine test results?

While having a cold or flu generally doesn’t directly affect creatinine levels, dehydration due to fever or reduced fluid intake can cause temporary increases in creatinine levels. If you’re feeling unwell, it’s important to inform your healthcare provider, as acute illnesses can affect kidney function. Your doctor may recommend postponing the test or may take the illness into account when interpreting the results, particularly if your creatinine levels are elevated.