What time after the evening before a liver function test should one stop drinking water?

　　Liver function tests, also known as liver function examinations, require fasting for 8–12 hours prior to testing. For example, if blood is to be drawn between 8:00 and 10:00 AM the next day, no water should be consumed after 8:00 PM the previous night to avoid affecting test results.

　　Liver function tests help determine whether the liver is functioning normally and can assist in diagnosing various diseases such as hepatitis and cirrhosis. Because liver function indicators are highly sensitive to blood concentration, maintaining stable blood concentration before testing is essential for accurate results. Therefore, fasting for 8–12 hours is required, during which time eating or drinking should be avoided. For instance, if blood is drawn between 8:00 and 10:00 AM the following day, drinking should cease after 8:00 PM the night before. Consuming water increases blood volume and causes dilution, potentially affecting the accuracy of liver function measurements. It is recommended to strictly follow medical advice and properly arrange all pre-test requirements.

　　If abnormal results are found after a liver function test, it is advisable to undergo further examinations under a doctor’s guidance to identify the underlying cause and receive appropriate treatment to improve liver health.