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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.


Ashley RL, Wald A. Genital Herpes: Review of the epidemic and potential use of type-specific serology. Clinical Microbiology Reviews. 1999;12(1):1-8.

Gardella C, Huang ML, Wald A, et al. Rapid polymerase chain reaction assay to detect herpes simplex virus in the genital tract of women in labor. Obstet Gynecol. 2010;115(6):1209-1216.

Genital herpes diagnosis. National Institute of Allergy and Infectious Diseases website. Available at: http://www.niaid.nih.gov/topics/genitalHerpes/understanding/Pages/diagnosis.aspx. Update January 26, 2011. Accessed May 23, 2013.

Genital herpes—CDC fact sheet. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/std/herpes/STDFact-herpes.htm. Updated February 11, 2013. Accessed May 23, 2013.

Herpes genitalis. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what. Updated May 2, 2013. Accessed May 23, 2013.

Strick LB, Wald A. Diagnostics for herpes simplex virus: is PCR the new gold standard? Mol Diagn Ther. 2006;10(1):17-28.

Workowski KA, Berman S, Centers for Disease Control and Prevention. Sexually Transmitted Diseases Treatment Guidelines, 2010. MMWR. 2010;59(No. RR-12):1-110.

Last reviewed May 2013 by Brian Randall, MD

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.

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