Why Is It Necessary to Fast Before Blood Drawing?

Blood tests taken on an empty stomach are more accurate and authentic. Therefore, it is necessary to have an empty stomach before blood tests to avoid drinking water and eating. If patients have abnormal liver and kidney function or abnormal blood lipids, they need to have blood tests for further examination in the hospital. In this case, they will be required to have an empty stomach. It is best to have blood tests in the morning to avoid being hungry for a long time.

1. Authentic results: As the basic metabolic condition of the human body is relatively good on an empty stomach, fasting blood tests can reflect the true condition of human blood and eliminate the influence of diet and other factors.

2. More accurate: Do not eat a lot of food, because after eating some food, some components in the blood will enter the blood, leading to an increase in the concentration of certain components in the blood, which may affect the accuracy of the test results.

3. Avoid misdiagnosis: If food is consumed before a morning blood test, a large number of chylomicrons produced after digestion will be rapidly absorbed into the blood, making the blood cloudy. This is medically known as lipemic blood. If the blood becomes cloudy due to chylomicron particles, it will be difficult for inspectors to observe clearly, especially during the detection of hyperlipidemia, as the presence of lipid plasma can affect the measurement.