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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.
Tests to confirm syphilis. Tests used to confirm a syphilis infection include: 1  Enzyme immunoassay (EIA) test. 2  This blood test checks for syphilis antibodies. 3  A positive EIA test should be confirmed with either the VDRL or RPR tests. 4  Fluorescent treponemal antibody absorption (FTA-ABS) test.5  This test also checks for antibodies.ests used to confirm a syphilis infection include: 1  Enzyme immunoassay (EIA) test. 2  This blood test checks for syphilis antibodies. 3  A positive EIA test should be confirmed with either the VDRL or RPR tests.