A young man with a negative initial HIV ELISA test asks how long after exposure HIV antibodies would most likely be detected in the blood?

• A. One to two weeks
• B. One to three months
• C. Six to twelve weeks
• D. One year

Answer: (B)

After exposure to HIV, it takes time for the immune system to produce detectable antibodies. Tests that detect antibodies, like ELISA, are negative early because seroconversion hasn’t occurred yet. In most people, HIV antibodies become detectable within about 1 to 3 months after exposure, with many seroconverting by around 6 to 12 weeks. Because of this window period, a negative result soon after exposure doesn’t rule out infection, and repeat testing is advised at later intervals. Therefore, the timeframe of one to three months best describes when antibodies would most likely be detected.