Infection

Herpes — The Honest Test for HSV-1 & HSV-2

Let's be straightforward: herpes is incredibly common and still surrounded by way too much stigma. HSV-1 usually shows up as cold sores around the mouth. HSV-2 is more commonly linked to genital herpes. Both types can be passed on even without visible symptoms — which is exactly why this test matters. It checks for IgG antibodies that appear after infection and stick around for life. One blood draw, clear answers.

Why Test Herpes Blood Test?

This test is mainly useful when you have recurring blisters or sores, when a partner has genital herpes, or during pregnancy planning where infection status changes the care given. It is not recommended as a general check without symptoms: a positive HSV-2 result at a low level is often a false positive, and a positive result cannot tell you when or from whom the infection came. Where a sore is present, a swab from the sore is more informative than a blood test.

What Do High Herpes Blood Test Levels Mean?

Positive HSV-1 IgG means you've been infected with HSV-1 — usually oral herpes, though it can also be genital via oral contact. Positive HSV-2 IgG points to a past HSV-2 infection, typically genital herpes (which may have been completely silent). Positive results confirm lifelong viral carriage.

What Do Low Herpes Blood Test Levels Mean?

A negative result for both HSV-1 and HSV-2 IgG means no antibodies were detected. Antibodies can take up to twelve to sixteen weeks to appear, so a negative result does not exclude a recent infection: retest after that period if you have had a possible exposure. If you have an active sore, a swab from the sore is more informative than a blood test.

Symptoms to Watch For

  • Painful blisters or sores around the mouth or genitals
  • Itching, burning, or tingling before an outbreak
  • Fever, headache, or muscle aches during the first outbreak
  • Recurring outbreaks in the same spot
  • Some people have no symptoms whatsoever

Who Should Get Tested?

  • People with recurring blisters or sores around the mouth or genitals
  • People whose partner has genital herpes
  • People planning a pregnancy where infection status affects care
  • Not recommended without symptoms: false positives are common and a result does not show when the infection was acquired

How to Prepare for Your Test

No special preparation needed. Keep in mind that IgG antibodies can take 12-16 weeks after exposure to show up. Bring valid ID.

Frequently Asked Questions

What's the difference between HSV-1 and HSV-2?
HSV-1 typically causes cold sores on the mouth; HSV-2 is more often genital. But either type can infect either location through oral-genital contact.
Can I have herpes without symptoms?
Yes — and that's incredibly common. Many people carry HSV-1 or HSV-2 without ever having a noticeable outbreak. That's exactly what makes blood testing so valuable.
How long after exposure should I wait to test?
About 12-16 weeks. IgG antibodies need time to develop. Testing too early might give you a false negative.
NW

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Wellth Team

Wellth

Our content is written and reviewed by Wellth, and fact-checked against peer-reviewed research and current Swedish clinical guidelines.

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Medical Disclaimer

The information on this page is provided for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Wellth provides health information and testing services but is not a substitute for clinical care. Always consult a qualified healthcare provider if you have questions about a medical condition. If you are experiencing severe or urgent symptoms, contact your doctor or call 1177 Vårdguiden. Blood test results should be interpreted by a qualified healthcare professional in the context of your complete medical history.