Not fasting for liver function tests can have a significant impact on the final results, especially on the transaminase test results. Liver function tests need to be performed on an empty stomach, which requires fasting and water fasting for at least 8 hours. If more water is consumed, there is a risk of blood thinning and the results of liver function tests may drop to varying degrees, with possible false negative results. And if you eat, especially high-fat and greasy food, it will cause a significant increase in liver function indicators, especially a more pronounced increase in transaminases, which may result in false positive results and affect the judgment of whether there is damage to liver cells. However, for patients with certain diseases such as hypertension, even if liver function tests are performed, drinking a very small amount of water early in the morning to facilitate the administration of medications is acceptable and will not affect the results of the liver function tests or the clinical judgment.