Fasting blood test in the morning at 12 o’clock is possible to draw blood, fasting test refers to the time in fasting for more than 8 hours, after waking up in the morning to draw blood from the vein. If you have not eaten in the evening, to the hospital after the examination of more people, before 12 o’clock is also possible to draw venous blood for examination. Blood test is only a common medical examination, mainly including blood routine, biochemical examination and so on. The blood test can understand the patient’s liver function, AIDS, pregnancy, drug addiction and other conditions. Because the reference values of certain test indexes are set on an empty stomach, the test needs to be performed on an empty stomach. The tests include biochemical tests such as liver and kidney function, blood glucose, lipids, electrolytes and cardiac enzymes, and rheumatological tests such as anti-O and rheumatoid factor, which also need to be performed on an empty stomach.