HSV-2+ means you have tested positive for herpes simplex virus type 2, the strain most commonly associated with genital herpes. It indicates your blood contains antibodies against the virus, meaning your immune system has encountered it at some point. This does not necessarily mean you have ever had visible symptoms, and many people learn their status only through a blood test.
What the Test Actually Measures
An HSV-2+ result almost always comes from an IgG antibody blood test. Rather than detecting the virus itself, this test looks for antibodies your immune system produced in response to the infection. The result is reported as an index value, and where that number falls matters more than most people realize.
An index value below 0.90 is considered negative. Values between 0.90 and 1.10 are equivocal, meaning the test can’t determine your status. Anything above 1.10 is reported as positive. But here’s the critical detail: index values between 1.10 and 3.50 are considered “low positive,” and the CDC recommends confirmatory testing for results in that range. One study found that roughly 1 in 5 HSV-2 results with index values below 3.0 turned out to be false positives. If your index value is in that low-positive zone, your result may not be accurate.
For values above 3.50, the likelihood of a true positive is much higher, and confirmatory testing is less commonly needed.
When a Low-Positive Result Needs a Second Look
If your index value falls between 1.10 and 3.50, the gold standard for confirmation is the Herpes Western Blot offered through the University of Washington. This test separates viral proteins and checks whether your blood reacts to them, making it far more specific than the standard screening test. It reports a clear positive, negative, or indeterminate result for both HSV-1 and HSV-2.
The Western Blot is not FDA-cleared and is only available through the University of Washington’s virology lab. It runs twice a week, on Mondays and Thursdays, and cannot be ordered on a stat basis. Your provider needs to contact the lab directly for ordering instructions. It is not a routine lab test, but for people sitting in that uncertain low-positive range, it can resolve months of anxiety in either direction.
Why Many People Have No Symptoms
A positive HSV-2 result surprises many people because they have never had a noticeable outbreak. This is common. The majority of people carrying HSV-2 either have no symptoms at all or have symptoms so mild they were never recognized as herpes. Occasional irritation, a small bump that healed quickly, or what looked like an ingrown hair could all have been minor outbreaks that went unnoticed.
Whether or not you have symptoms, the virus remains in your body permanently. It lives in nerve cells near the base of the spine and periodically reactivates, traveling to the skin’s surface. This reactivation doesn’t always produce visible sores.
Viral Shedding and Transmission Risk
Even without symptoms, the virus can be present on the skin’s surface, a process called asymptomatic shedding. This is the primary way HSV-2 spreads. Roughly 80% of transmission events happen during these invisible shedding episodes, not during visible outbreaks.
How often shedding occurs changes over time. In the first year after the initial episode, the virus sheds on about 26% of days. Between years one and nine, that drops to around 13% of days. After ten years, shedding falls to about 9% of days. The virus becomes less active the longer you carry it, though it never disappears entirely.
Overall, studies estimate that the average person with HSV-2 sheds the virus on about 18% of days when sampled. On most of those days, there are no symptoms at all.
Reducing the Risk to Partners
For couples where one partner has HSV-2 and the other does not, several strategies lower the chance of transmission. Avoiding sexual contact during active outbreaks is the most obvious step, but since most transmission happens without visible sores, additional measures help significantly.
- Daily antiviral therapy: Taking a daily antiviral medication reduces both the frequency of outbreaks and the amount of asymptomatic shedding, which cuts transmission risk substantially.
- Condoms: Consistent condom use provides a meaningful layer of protection, though it doesn’t eliminate risk entirely because the virus can shed from skin not covered by a condom.
- Combining both: Using daily antivirals and condoms together offers the greatest reduction in transmission risk.
Transmission is not inevitable. Many discordant couples (where one partner is positive and the other negative) go years without transmitting the virus, especially when using these precautions consistently.
What Outbreaks Look and Feel Like
When symptoms do occur, the first outbreak tends to be the most severe. It typically involves clusters of small, painful blisters or open sores in the genital area, sometimes accompanied by flu-like symptoms such as body aches, swollen lymph nodes, and fever. The first episode can last two to four weeks.
Recurrent outbreaks are generally shorter and less painful. Many people notice a tingling, itching, or burning sensation in the area before sores appear. This warning phase, called a prodrome, signals that the virus is reactivating and that you are more contagious. Over time, outbreaks typically become less frequent and less severe. Some people stop having noticeable outbreaks altogether after the first few years.
HSV-2 During Pregnancy
If you are pregnant or planning a pregnancy, your HSV-2 status is important information for your care team. The primary concern is neonatal herpes, a rare but serious infection that can occur if the virus is active in the birth canal during delivery.
The risk is highest for women who acquire HSV-2 for the first time late in pregnancy, because the immune system has not yet built up protective antibodies. For women who had HSV-2 before pregnancy, the risk to the baby is much lower because those antibodies cross the placenta and offer some protection.
Women with a history of genital herpes are typically started on daily antiviral medication at 36 weeks of pregnancy to reduce the chance of an outbreak at delivery. At the onset of labor, the medical team checks for active lesions or prodromal symptoms. If there are no signs of an active outbreak, vaginal delivery is considered safe. If sores or symptoms are present, a cesarean delivery is recommended to protect the baby.
Why You May Not Have Been Tested Before
Many people assume that a standard STI panel includes herpes testing. It typically does not. The CDC does not recommend herpes screening for people without symptoms in most situations, primarily because of the limitations of blood tests and the relatively high chance of false positives in low-risk populations. This is why an HSV-2+ result often comes as a shock: most people have never been tested before and had no reason to think they were carrying the virus.
If you specifically requested herpes testing, or if your provider ordered it because of symptoms or a known exposure, the clinical context makes the result more meaningful. A positive result in someone with a history of genital sores is far more reliable than the same index value in someone with no symptoms and no known exposure.