To check whether it is okay to drink water for hepatitis B two-to-one, it is recommended that patients generally do not drink or eat before having their blood drawn and that they do so on an empty stomach. This is because for patients who have their hepatitis B two-to-one test, there is a possibility that they may also have a hepatitis B three system test. For this type of test, if the patient drinks or eats, it will affect the accuracy of the test. If the patient eats or drinks water, it will cause changes in the liver function of the patient, which will not reflect the true state of the liver. It is also recommended that patients undergo an ultrasound of the upper abdomen on an empty stomach, without drinking or eating. If the patient eats, it will cause the excretion of bile from the patient’s gallbladder, and the situation inside the gallbladder and whether there are stones, inflammation or polyps in the gallbladder cannot be seen more clearly. Therefore, for patients with normal physical examination, it is recommended that the examination be performed in the morning on an empty stomach, without drinking or eating, and the results of the examination are more accurate. If patients want to consider eating, it is recommended to consult the doctor or nurse in the medical examination department after the completion of the relevant examination before considering eating or drinking.