Differential Diagnosis
Patient has an HIV infection.
Screening test is a false-positive; there is no HIV infection.
Suggested Additional Lab Testing
Western blot
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Most important test for patient with a positive HIV screening test
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Will determine if patient has antibodies to specific HIV-associated proteins
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Will confirm or refute a diagnosis of HIV infection.
CD4 count
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Some HIV-positive patients have a low CD4 count.
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Extent of decrease may be useful in making decisions about prophylaxis against opportunistic infections.
HIV viral load
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More than 5000 copies/mL suggests progression
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Less than 5000 copies/mL is the target for successful treatment of HIV.
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