An STD test is a medical test for the presence of any of a number of sexually transmitted infections (STIs), and are usually performed after symptoms are detected (disease), but may detect asymptomatic or presymptomatic infections.
An STD test is a medical test for the presence of any of a number of sexually transmitted infections (STIs). Most STD tests are blood tests, and are usually performed after symptoms are detected (disease), but may detect asymptomatic or presymptomatic infections.