I have read your article on Home Tests and their accuracy and have a question regarding their sensitivity. According to your FAQs the average person shows antibodies at 25 days, usual is 3 months and maximum is 6 months. However, isn't this true only for 3rd generation EIA tests which reduced the average from 45 days to 25 days. I have taken Home Access tests at 18 and 22 weeks, both of which were negative. I read today that they use a first generation EIA approved in 1990 and an IFA rather than a Western blot for confirmation. How confident can I be in those results.

Confidence in results depends upon your personal judgement of the facts. Antibody tests are generally not considered accurate before three months have elapsed since exposure, and are considered accurate (with some debate) between three to six months after exposure (please see my response to Definite Exposure for more information on this). 22 weeks is darn close to six months and would presumably render your test highly accurate.

RMK