Hello guys, te answer to shadow2's question is absolutely, yes. The only thing that can determine HIV status be it positive or negative is an HIV-specific test. The 3 most known types of assays are as follows:
-P24 Antigen - Looks for a protein sequence often particular to HIV. Needs to be done within the 3rd-4th week post possible exposure in order to yield an accurate result. Confirmatory ELISA/WB assay is usually performed in case of positive result.
-PCR DNA / PCR RNA - Looks for DNA/RNA sequences specific to the HIV virus. Research tool, very sensitive and expensive. Can detect HIV infection very soon. Not recommended for the average patient (people who have sex with individuals of unknown or unconfirmed status) unless a known contact with HIV has occurred.
-Enzyme Linked Immuno Assay (ELISA) - Detects the presence of antibodies to the HIV virus. Needs a waiting period of at least 3 months from possible exposure in order to yield a conclusive result, since detectable antibodies need to be produced by the body. Most widely used form of assay. Positive results are confirmed with a Western Blot assay which is a more sensitive test, although not recommended for use apart from the ELISA.
Now, lets talk about the CBC. The reason why the CBC cannot be used to diagnose HIV is the fact that organisms react vastly different from one another, it is true that on some individuals (usually medium-older age patients) do present abnormalities in their blood counts, most younger individuals do not. Furthermore, blood counts can be affected by just about any condition or illness totally unrelated to HIV. For this reason, detailed CD4 counts on a person who has not been confirmed HIV positive through any of the assays mentioned above, are totally meaningless.
Hope the info helps.
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Best wishes.
[This message has been edited by anyone (edited 07-18-2003).]
[This message has been edited by anyone (edited 07-18-2003).]
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Best wishes.
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