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The Red Cross is also a leader in research and testing to protect the safety of the blood supply. We were among the first to develop and implement testing for many infectious diseases including, HIV, hepatitis B and C viruses, West Nile virus, and more recently the agent of Chagas disease.
Blood tests are done to help diagnose hepatitis B. They include: 1  Hepatitis B antigens and antibodies. 2  Tests to see if the hepatitis A, hepatitis C, or Epstein-Barr viruses are causing your hepatitis. 3  Tests to see if you are infected with hepatitis D along with hepatitis B.our doctor will diagnose hepatitis B based on a physical exam and blood tests. He or she also will ask about your medical history (including possible risks for the virus, such as your job and sexual activity).