How to Explain a Positive HSV-2 Antibody Test to a Patient
Start by explaining that a positive HSV-2 antibody test means they have been exposed to the herpes simplex virus type 2 at some point in their life, but emphasize that the test result may need confirmation depending on the specific test used and their clinical situation, as false positives are common with certain testing methods.
Understanding the Test Result
The HSV-2 antibody test detects immune proteins (antibodies) your body made in response to HSV-2 infection. However, not all positive results are truly positive 1, 2, 3. The accuracy depends heavily on:
- Which specific test was used (different brands have vastly different false positive rates)
- The numerical "index value" of the result
- Whether you have symptoms or a history of genital lesions
Critical Testing Limitations
If the test index value is between 1.1 and 3.5, there is a high likelihood (up to 65-80%) that the result is falsely positive 1, 2, 4. This is especially true if:
- You tested positive on the DiaSorin assay (nearly 1 in 3 positive results are false) 3
- You have no history of genital symptoms 4
- You also have HSV-1 antibodies (oral herpes) 4
Confirmatory testing should be strongly considered for low-positive results using either a different test method (like Biokit rapid test or Western blot) or retesting with a more specific assay 2, 5.
What This Means Clinically
If You Have Symptoms
If you've had genital symptoms (sores, blisters, painful lesions, or even atypical symptoms like itching or burning), the positive test helps confirm HSV-2 as the cause 6. In this case, the test is more likely to be accurate.
If You Have No Symptoms
Approximately 20% of people with HSV-2 antibodies never notice any symptoms 6. This is called asymptomatic infection. You can still:
- Shed virus and potentially transmit it to partners
- Develop symptoms in the future (though many never do)
Management Options
Once confirmed positive, you have two evidence-based treatment approaches 6:
Suppressive Therapy (Daily Medication)
- Take antiviral medication (acyclovir, valacyclovir, or famciclovir) every day
- Reduces viral shedding and transmission risk to partners
- Prevents recurrent outbreaks
- Recommended if you want to reduce transmission risk or have frequent outbreaks
Episodic Therapy
- Take medication only when you have an outbreak (3-5 days)
- Treats symptoms but doesn't prevent transmission between outbreaks
- Appropriate if outbreaks are infrequent
All patients should be offered suppressive therapy as an option 6, particularly if they have a sexual partner without HSV-2.
Important Caveats
- Screening is not recommended for asymptomatic people without risk factors 6, so if you were tested without symptoms or known exposure, discuss with your provider whether the test was appropriate
- The U.S. Preventive Services Task Force recommends against routine screening because of the high false-positive rate in low-risk populations 6
- If you're pregnant, HSV-2 status matters for delivery planning, but routine screening during pregnancy is not recommended 6
Next Steps
- Verify the test type and index value with your healthcare provider
- Consider confirmatory testing if the index value was <3.5 or if you have no symptoms 2, 4
- Discuss treatment options based on your symptoms, relationship status, and transmission concerns
- Inform sexual partners so they can make informed decisions about their risk