For positive kidney function, this expression is rarely used in clinical practice. Generally, it is impaired kidney function and increased blood creatinine, and the indicator reflecting kidney function is to check blood creatinine and urea nitrogen. If the blood creatinine is elevated, it indicates that the patient’s kidney function is impaired. There are many reasons for kidney function damage, such as glomerulonephritis, drugs and systemic diseases, which can cause kidney damage; cardiac insufficiency can also affect the kidneys, so a positive kidney function may mean impaired kidney function and increased blood creatinine. If increased blood creatinine occurs, it must be paid great attention because the kidney has a strong compensatory function. Blood creatinine indicator is not a very ideal indicator, it will not be elevated until the kidney function is impaired to a certain degree, once the blood creatinine exceeds the upper limit of normal, it means that the kidney has lost more than 50% of its function. So if you find elevated blood creatinine, you must go to the hospital in time to see a nephrology specialist to find the cause of elevated blood creatinine and treat it accordingly to prevent further continued damage to kidney function.