For home STI screening, you collect an urine sample or a genital or dental swab and then send it to a lab for analysis. No excellent testing test exists for herpes, a viral infection that can be transferred also when a person doesn't have signs and symptoms. Your medical professional might take a tissue scratching or culture of sores or very early abscess, if you have them, for assessment in a laboratory. Yet an adverse test does not eliminate herpes as a cause for genital ulcers. Chlamydia and also gonorrhea testing is done either through a pee examination or through a swab inside the penis in guys or from the cervix in females.