You can drink a small amount of plain water before checking blood creatinine.
Blood creatinine is an indicator that reflects the filtration function of the kidney, which is mainly produced by its own muscle decomposition, with a small portion ingested by food. Drinking a small amount of water before the test has no effect on this indicator, so you can drink a small amount of water before the test, especially if you have chronic diseases, such as high blood pressure, diabetes, you can drink a small amount of water to take medication, which will have little effect on the results.
However, try to avoid drinking large amounts of water in a short period of time, as this can dilute the blood and may cause inaccurate results.
If a patient needs to have a blood creatinine test, it is recommended to go to a regular hospital to have the test results prescribed and evaluated by a professional doctor.