Skip to Main Content

Herpes is a lifelong infection, but Lauren had it only for six tumultuous months. Or rather, she believed she did, after a request for sexually transmitted disease testing returned a positive result. But after weeks of Googling, chatting with members of online herpes forums, and reading scientific papers, she asked for a different test, which eventually confirmed her suspicion — her herpes diagnosis was wrong.

In the six months that passed between the tests, the mistake led her to keep a romance at bay and left her anxiously patrolling her health.“Every tingle I would get in my leg or any kind of itch down there would just set me off,” sending her into a new flurry of research, she said. “And that was just to try to calm my own anxiety, but it would only really make it worse.”

Genital herpes, predominantly caused by herpes simplex virus type 2, is a sexually transmitted disease that’s very common — 1 in 6 people aged 14 to 49 in the United States have HSV-2, and this number goes up with age. Most of these people, however, don’t have obvious symptoms and wouldn’t know they were carriers without blood tests.


But blood tests can be highly unreliable. The kind of test used to diagnose Lauren, an IgM test, has long been rejected by the Centers for Disease Control and Prevention but is still used by some clinicians. Meanwhile, the CDC and the US Preventive Services Task Force concur that the most widely available herpes test, called HerpeSelect, should not be used to screen asymptomatic people because of its high risk of false positives: Up to 1 in 2 positive tests could be false, according to the USPSTF’s most recent guidelines.

That high failure rate isn’t, however, always communicated to patients. Online forums abound with stories like Lauren’s, of people who request herpes tests alongside those of other STDs and are shellshocked by the results. Some doctors discourage the testing or simply don’t include it in a standard STD panel without having the conversation. But no data exists on herpes screening rates, according to Kimberly Workowski, lead author of the CDC’s STD treatment guidelines — so it’s difficult to say how many people could be living with the misdiagnosis.

Herpes simplex
A micrograph of herpes simplex virus in a Tzanck test specimen. CDC

Testing pitfalls

Next to the meandering waterways connecting Puget Sound to Seattle’s Lake Washington is the only laboratory in the world that offers to the public the Western blot, the gold standard test for herpes. The University of Washington Clinical Virology Laboratory provides the test to patients across the country, a practice it began over a decade ago when it realized the more common tests were prone to false positives.


The problem, said Christine Johnston, a physician and researcher at the lab, is “low-positive” results of antibodies to HSV-2. The cutoff for a positive result on the HerpeSelect test, manufactured by Quest Diagnostics, is 1.1. A 2005 study published in the journal BioMed Central Infectious Disease found that index values above 3.5 yielded over 90 percent accuracy — but scores between 1.1 and 3.5 had around a 50 percent chance of being wrong.

What’s more, scores falling just above the 1.1 cutoff had an almost 90 percent chance of being wrong.

When tests fall between 1.1 and 3.5, more testing is necessary, said Johnston. This recommendation is also noted in the 2015 CDC Sexually Transmitted Diseases Treatment Guidelines. But some patients will never be referred for a second test.

“I think most clinicians are unaware and perhaps labs don’t have this available and/or it is not straightforward to order,” Johnston said of second-step tests.

But while her facility’s Western blot is considered highly accurate, it is expensive and cumbersome to perform. Each test costs over $200 and the University of Washington is the only lab that provides it.

Other confirmatory tests also exist, for instance Biokit’s HSV-2 Rapid Test and Quest’s own HSV-2 IgG Inhibition assay. The latter, which adds only $4 to the price of the HerpeSelect test, performed well in a study conducted over a decade ago. Rick Pesano, the medical director for infectious disease at Quest, believes that with more awareness, the test could stand in for the Western blot. But the test was not mentioned in the USPSTF guidelines because it still has not been evaluated in asymptomatic individuals, according to Cindy Feltner, associate director of the RTI-UNC Evidence-based Practice Center, who helped prepare the science review for USPSTF.

“We need better diagnostic testing. That is where we are stuck at this point,” said Johnston. “We don’t have a good test that’s inexpensive, high throughput, and reliable.”

Finding out the hard way

No good data exist on how often patients with questionable positive results are actually re-tested. Until the 2015 update, CDC herpes testing guidelines had no mention of confirmatory testing for low-positive results, said Johnston. So patients often discovered the option not through their doctors, but through searching the web and reading online herpes forums.

That was the experience of Bryan, a 40-year-old man who lives in Indiana, who wrongly believed he had herpes for about two months in 2011. The misunderstanding actually put him at higher risk, he said: During those months he considered joining the hundreds of thousands of Americans on dating sites for herpes-positive people. Exclusively dating people with herpes would have increased his likelihood of contracting the virus.

The experience of YT, a 33-year-old mom who has suffered from frequent herpes symptoms over the last year, shows another side of the testing breakdown. She believes she was given HSV by a partner who didn’t realize herpes wasn’t included in his previous STD tests, she told STAT. Having herpes has caused her significant emotional trauma, and has driven her to permanently swear off dating. Had her partner known his true status, she wonders if her story would have been different.

These kinds of stories come out in anguished postings on internet forums and in dozens of confused calls to the UW lab each week, where research coordinator Matt Seymour says some desperate patients call over and over again, unable to get the answers they need from their doctors.

“People call and say, ‘I just don’t know what’s going on,’” he said. “We’ve almost become de facto counselors.”

Transmission electron microscope scan of cytomegalovirus particles. CDC

In the absence of answers

Herpes tests aren’t the only ones with a risk of false positive results. False positives can occur for any test that diagnoses viral infection based on antibodies, i.e., your body’s immune reaction, rather than direct detection of the virus. For similar diagnostics like HIV and hepatitis C testing, protocols automatically call for a second test that directly detects the virus whenever an antibody test comes back positive, said Paul Swenson, laboratory director in the department of public health of King County, Washington. Herpes, however, is a particularly challenging infection to directly test for, because the virus spends most of its time hiding in nerves. Swab tests can sometimes detect the virus during outbreaks, but this isn’t an option for people without symptoms. Thus even the Western blot relies on antibodies, and may give indeterminate results to a small number of people.

But two steps of antibody testing are still more reliable than one step; today’s diagnostics for Lyme disease and syphilis are a two-step antibody testing approach, said Dr. Edward Hook, a medical epidemiologist specializing in STI screening and prevention at the University of Alabama, Birmingham, who questioned why such a standardized two-step approach hasn’t taken firm hold for herpes.

“Some research has shown that two-step testing … might improve the specificity — that is avoid false positive results for the blood test — which would be a great thing because these diagnoses create great anxiety and concern for people,” he said. In a commentary accompanying the USPSTF guidelines, Hook expressed disappointment that herpes testing had barely improved over the past decade.

“There is no perfect test but there are ways to reduce the inaccuracies and reduce the number of equivocal results and those are actively used in other diseases,” he said in an interview with STAT. “But they haven’t been used very aggressively for the purpose of herpes.”

In the absence of sure-fire test advances, education and a lessening stigma surrounding herpes might help, not only by reducing test-related confusion, but potentially by bringing discussion of the virus out into the mainstream, said Hook.

“There’s no major herpes advocacy group,” he said. “People call attention to diseases that they suffer from, but people with herpes don’t feel they can call attention to it. And that creates a lot of suffering.”

  • So I never post anywhere but today I decided to do it here because I know many of us are struggling with this. I know how it feels. The anxiety this brings. The shame and the regrets. I am a 24 years old women. I became sexually active when I was almost 22 years old. I recently was diagnosed with HSV2 (genital herpes) by a nurse practitioner. I originally came to the doctor office to see the GYN as I am very careful and do my STDs panel exam every 6 months. This was on July this year. Everything was normal except my HSV2 blood result (IGG 1.06). Blood work was sent to a Quest Diagnostics Lab. The nurse practicer told me that my HSV2 came back positive and there was nothing I can do at this point because I can’t really tell when I got it and from whom I got it. As a female that just became sexually active 2 years ago, I felt devastated. I felt dirty and regretted everything. Today, I feel more calm with an unknown status as I have been doing a lot of research. I decided to make another appointment to see another GYN, who has more knowledge and has been on the medical field for longer. I went 4 days ago to visit him. I spoke with him before repeating my blood work. He saw my past lab result and was shocked that I was diagnosed with Genital Herpes when the blood result was on the equivocal range. He stated that if you are an experienced GYN, you would never request the Herpes test unless you have current symptoms of Herpes sores because of the false positives and the anxiety this brings. He decided to repeat the test because he stated that since I already got the test done before, it was required to be repeated. I am currently waiting for my results. He stated that if it comes back on the equivocal range we will repeat testing by doing the Western Blot. I am just letting you guys know that please be sure to go to an experienced specialist. If the blood result comes back and it is less than a IGG 3.5, make sure to repeat testing. I have been doing a lot a lot of research. Make sure the test is IGG and not IGM.

    • Thank you so much for that glimmer of hope. I went last month just to do a random test screening of all STDs and had a positive result for HSV-2 but had 2 Negative results prior and haven’t had any outbreaks. I was never told what the antibodies levels were so I’ll be sure to get the test papers and possibly do a re test considering all these false positives I hear about.

  • I went to the doctor today and I have very tiny sometimes red, sometimes flesh colored lesions (sores) that absolutely do not hurt, extremely rare itch, but they have reoccured in different spots on my penis. Never hurt, very little itching. I’m waiting on my blood test results because she says it looks like herpes but I’m hoping it could be some other Sti or Std.. anybody know what it could be??

  • A comment left by the person Chris provides a the link and number. Thankfully people still read this article.

  • I have noticed that many comments concerning the western bloc test as being the only test for 99% accuracy. Many commenters are asking how these people took this test and to please walk them through it? So far I have not seen any responses from anyone. Why doesn’t This site give us the answer and the way to take the test?

  • Just wanted to post this because of the unnecessary stress caused by the cheap STD test I took at a walk in clinic and maybe I can spare some people the stress… I went to the clinic to get my test done for the whole list of possible STD’s (ironically to be able to show my female friend with benefits a clean chit for her peace of mind). The following week, I got my results online and they showed I negative on all non HSV STD’s but was massively positive for HSV-1 (score of 47.6!) and slightly positive for HSV-2 (score of 1.7). It caused a lot of stress for us and basically put us on hiatus until later when this was resolved. I wasn’t worried about the HSV-1. I knew I had it as I had a cold sore in the past and HSV-1 is arguably not even an STD. I was really worried about the HSV-2 though even though I never had any symptoms. After doing lots of research, I spent a significant amount of money to get the Western Blot HSV-2 test done at the University of Washington. The kit was free but the analysis was around 250$ and the high speed refrigerated shipping was another 90$. After a stressful 2 weeks, I got the results back that I absolutely did not have HSV-2. I personally know a couple friends that are trusting their results from the cheaper HSV-2 test and assume they actually have it even though they also have no symptoms. I know now that if you really want to know for sure, you have to spend the money and get the better test done.

    • How do go about getting the western blot test? I scored 1.23 for type 2 and have all but lost my mind.

    • Check out the below website and call the number and they will walk you through the process. Good luck.

      “Where can I get tested?

      If you are having oral or genital lesions, these can be tested for HSV by PCR/NAAT or culture through your local healthcare provider. Tests for HSV antibodies may also be available through your local healthcare provider. You can have your blood tested with a Western Blot at the University of Washington Virology Lab. To do this, you or your health care provider can call 206-520-4600 to request the HSV Type-Specific Serology information packet.
      For more information, see the Herpes Blood Tests Quick Reference Guide provided by the American Social Health Association.”

    • After you got the Western Blot test what were your numbers for HSV 2? I recently tested a low positive for HSV 2, but have never had any symptoms so I convinced my doctor to order the western blot kit. I’ve felt sick to my stomach for over a week now. I know that having HSV 2 isn’t life threatening but it makes me want to kill myself.

    • Madison, the Western Blot test directly detects the virus instead of trying to count antibodies. So its a yes or no test with no number score. Good luck! Worth the money for peace of mind. If you have no symptoms, you’ll probably pass if you had a pretty low score on the cheaper test.

  • I woke up with a bump lip on sunday and i went to the doctor on monday morning. I got tested and the results came negative (IgM HSV-1) negative. Then on Tuesday i went to planned parenthood got a blood work done test again, it came out positive (HSV-1 IgG) i feel like my world is tumbling down to pieces… im so sad my life is over.

    • 80 % people have hsv 1 oral this is not a worry, maybe u will never c that on the lip in your entire life don’t worry about it relax its not big deal

  • The hsv2 IgG says 1.62 but the swab was negative and the hsv2 IgG says positive abnormal 1.62, I’m confused.

  • I need some guidance, I went into my local urgent care for testing because I cut myself near my vaginia lips while shaving and it started to hurt. The doctor did testing for everything, hiv aids and all the sti’s and hvs 1&2. She did urine, blood test and the culture swab on my cut. Well when she first called me she said everything was negative but HSV 1&2 were positive. I was devestated to say the least. One day later, she calls back and says the hvs 1 was actually negative but I do have 2. Well, I requested my lab results so I can follow up with my doctor, mind you she never gave me meds. Well the lab results say positive abnormal got hsv 2 with 1.62. However the culture swab is completely negative. I’m confused now do I have hsv or no? The lap paper also says to retest in 2-4 weeks. Helppppp

    • Swab test must be done 48 h after outbreak start, to be precise, blod tests are not reliable that much they can have 25 % false positive, she perform Igg test it can separate 1 from 2, it can be false positive some conditions in body can lead to some scores that is in range of positives doesn’t mean that couse by hsv.. So check ur self red areas, blisters that burning sensation while urinate and so on just don’t panic if u don’t have much symthoms wait 4 weeks than go to test again and change ur doc it’s always better to hear one more opinion I hope u are false positive

    • If you want to know for sure, request the Western Blot HSV2 Test from University of Washington. Between getting the blood drawn, paying the lab fee, and the shipping, it will set you back about 400$ but it was worth it for me to find out I was negative for sure.

  • Is anybody know something about those measurements Au per ml can’t find nowhere for hsv recently I get tested so I come up negative for igm but igg positive with some kind of number 29.6 au/ml don’t know is that high or low also the test doesn’t show which type is it only this can someone have explanation on this by the way I didn’t have blisters I had like balanitis on penis urethral inflammation also bladder after few days they found enterococus also faecalis in my urine my balanitis was present over a month :s

  • I have same situation i dont have any outbreaks or symptoms. My bf ask me to take a test if i have any disease like Hepa, Chlamydia, Syphillis, Gonnorrhae, HIV and Herpes. So when I found out the result just only one is reactive that is Herpes (herpes simplex virus) say herpes simplex virus igg detected.I call my doctor again to ask a specific type of HSV but the result is the same Reactive but the problem is i dont know which of Hsv 1 or hsv 2 is positive it didnt say in the report form. I dont have any outbreak.

Comments are closed.