For the testing the doctor will be in need to take a sample of blood from the patient's arm. To take the blood samples, the doctor will clean the site with a swab of rubbing alcohol and put a needle into a vein that’s attached to a tube. When the required blood has been collected in the tube, the needle is removed. The body is generally protected with an absorptive pad.
Now in case the blood sample is being taken from an baby or young child, the doctor can make use of a tool lancet instead of the needle used in case of adult. The use of lancet pierced the skin and it is less scary than a needle. The blood samples will then be composed on a table slide and a bandage will be used to protect the site. After this the blood samples will go to a laboratory for testing. Whether the patient is contagious will depend on which kind of virus the patient is infected with and how long you’ve been infected. There are also chances to spread viral hepatitis even when the patient doesn't have shown any symptoms. Now after the testing if the patient is diagnosed with HAV, then the patient is contagious from the starting of infection up to two weeks.