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how long

i want to know if retro-screening very effective for HIV test. and how soon can it identify if it positive or negative
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4 weeks to 3 months. You can obtain a conclusive negative test result 3 months post exposure.
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http://www.cdc.gov/globalaids/Resources/pmtct-care/docs/TM/Module_6TM.pdf
Page 11
#4
  In an adult, a positive HIV antibody test result means that the person is infected, a person with a negative or inconclusive result may be in the “window for 4 to 6 weeks but occasionally up to 3 months after HIV exposure. Persons at high risk who initially test negative should be retested 3 months after exposure to confirm results
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thank you but i want to know if it is very effective pls....
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