The items that need to be checked on an empty stomach are as follows. Usually, the blood test includes biochemical tests, especially liver function, blood sugar, uric acid and blood lipids, which need to be checked on an empty stomach. Endocrine laboratory tests require fasting, such as blood glucose and thyroid function tests, as well as endocrine gonadal series of tests, all need to be fasting blood collection. In addition to the fasting test, there are hepatitis B markers and rheumatism series of tests, which also require fasting blood collection. Lastly, abdominal ultrasound, such as multidimensional ultrasound of the liver, pancreas, gallbladder, spleen, and other digestive systems, are also performed on an empty stomach. Coronary angiography and CT of the coronary arteries, which require the injection of contrast material, are also best performed on an empty stomach.