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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.
The western blot test looks for immune responses to specific HIV proteins. When used as a confirmatory test, the western blot result is 100% accurate. (This assumes that there is not a lab error and that it is your sample that has been tested).owever, HIV tests are one of the more accurate tests for any medical infection. Tests showing a negative result are âinterpretedâ as negative. If the result is negative three months after exposure your result is interpreted as negative. This assumes you have had no further risks.