You can have breakfast for hepatitis B screening, but not if you are also checking your liver and kidney function, blood lipids or blood sugar. You can have breakfast without fasting during the Hepatitis B 5 (Hepatitis B 2.5) and HBV-DNA (Hepatitis B Virus Deoxyribonucleic Acid, which is the gene of Hepatitis B Virus) tests. This test is to draw venous blood to test the serological markers of hepatitis B virus, and the result level of the markers is not affected by drinking and eating, so it is not limited by time, so you can have breakfast and then take the test. However, if liver function, blood lipid and blood glucose tests are to be carried out at the same time as hepatitis B five tests, then the blood needs to be drawn on an empty stomach, because the protein, sugar and fat in the blood will fluctuate greatly after eating, and the test results will also be affected. Therefore, it is recommended to check with the doctor before going to the hospital to check the test items, if only the hepatitis B five tests, then you can eat breakfast without fasting.