Your doctor will ask about your symptoms and medical history. A physical exam will be done.

It is important for you to be open and honest with your doctor about your symptoms and your sexual history. Your doctor needs this information so that he can properly diagnose you and provide you with the proper treatment. Your doctor will not judge you or your behavior.

Sometimes genital herpes is easy to diagnose because the blisters or open sores are easily visible. However, just examining the sores or the rash is not enough. Also, you can have genital herpes even if the sores are not visible.

There are a number of lab tests available to diagnose genital herpes.

If your infection is visible, your doctor will rub a swab over an open sore or blister to collect some cells. The cells are then tested to see if the virus is present in those cells. It is recommended that this culture test be taken soon after symptoms appear.

This type of test is not always reliable, though. If the sore is healing or if you have recurrent outbreaks, the test may give a false-negative. This means that the test reports that you do not have herpes, when you really do have the virus.

PCR is a molecular diagnostic test. It detects genetic material of the virus. Like the viral culture, you could get a false-negative with this test, as well. But, the PCR test is much more accurate.

Your doctor may choose to do a blood test. These blood tests are also called antibody tests because they measure herpes simplex virus (HSV) antibodies—the disease-fighting substances in the blood. If the blood tests show HSV antibodies, you are most likely infected with the virus.

Tests can distinguish between HSV-1 and HSV-2. It is important that your doctor finds out if you have HSV-1 or HSV-2 because your treatment and counseling may be different depending on which virus you have.