For home STI screening, you gather a pee example or a oral or genital swab and afterwards send it to a lab for analysis. No good testing test exists for herpes, a viral infection that can be transferred even when a person doesn't have signs and symptoms. Your physician may take a tissue scraping or culture of sores or very early abscess, if you have them, for exam in a laboratory. But an adverse test does not eliminate herpes as a cause for genital ulcerations. Chlamydia as well as gonorrhea testing is done either via an urine examination or via a swab inside the penis in men or from the cervix in women.