Can creatinine levels fluctuate throughout the day?

Creatinine levels generally remain stable throughout the day, as creatinine is produced at a relatively constant rate by muscle metabolism. However, certain factors like exercise, dehydration, and diet can cause fluctuations. For example, intense exercise may temporarily raise creatinine levels due to increased muscle activity. To avoid these fluctuations, it’s recommended to avoid strenuous physical activity and stay hydrated before your test. Your doctor will guide you on how to prepare for the most accurate test results.