Whether you are a baby, an infant, or an adult, if you want to be tested for hepatitis B, including the hepatitis B triple test, hepatitis B viral load, or liver function, you will need to collect blood from a vein. Generally, the main place to collect venous blood is the vein in the elbow joint. If it is a child, his vein is not very good to find, can also be taken from the scalp vein to collect blood for laboratory tests, in general, it is to collect venous blood, that is to say, the peripheral blood of the routine blood test can not be checked for hepatitis B virus, or hepatitis B three pairs, including liver function tests, these are not possible, it is necessary to collect venous blood, for example, elbow joints or scalp veins, or can also be taken from the knee veins, etc., including the top of the feet, the veins, the veins, the veins, the veins, and so on, including the top of the feet. etc., including the veins on the top of the feet, but it must be venous blood.