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CD4 (cluster of differentiation 4) is a molecule that is expressed on the surface of T helper cells (as well as regulatory T cells and dendritic cells). On T cells, CD4 is the co-receptor for the T cell receptor (TCR) and recruits the tyrosine kinase lck. CD4 is also a coreceptor, along with the chemokine receptors CCR5 or CXCR4, for the HIV virus.
GoldBamboo
... Why get tested?
To measure the strength of your immune system if you’ve been diagnosed with HIV infection
When to get tested?
If you’ve been diagnosed with HIV, to get a baseline assessment of your immune system; four weeks after starting anti-HIV therapy and then every three to four months if you continue therapy
Sample required?
A blood sample drawn from a vein in your arm
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Lab Tests Online - more...
Schematic representation of CD4 receptor. CD4 (cluster of differentiat ...
Wikipedia - [full article]
Resources
- CD4 (Lab Tests Online)

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