In general, a fourth-generation HIV test is highly accurate at 45 days post-exposure, with the majority of individuals seroconverting by this time if they have been infected. However, some guidelines recommend retesting at 90 days post-exposure for conclusive results, as there is a very small possibility of a false negative result before this time.
If you're concerned or unsure, it's always best to consult with a healthcare professional who can provide personalized advice based on your specific situation and risk factors. They can guide you on whether retesting is necessary and any further steps you may need to take.
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