How long do you wait after unprotected sex before std screening?

Anytime: Some STDs will be able to be discovered after infection, so an exam and testing atanytine is helpful. Others like HIV and syphilis can take months to show up. However, if your behavior puts you at risk for stds, seek a physician consult now, not later...

Depends.: It depends on which kind of std. For hiv, even if you are infected, it takes a few months to identify the viruses by the lab test. But for some bacterial infection, you can take the tests in a few days.