References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
A herpes blood test detects antibodies your body has made in response to herpes simplex virus (HSV). It can tell you whether you’ve been exposed to HSV-1 or HSV-2 in the past, but it doesn’t tell you where the infection is or whether you’ll have outbreaks. UK sexual health services don’t routinely offer herpes antibody testing because results can be hard to interpret and often don’t change management.
Here’s what to know.
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What the Test Detects
| Result | Meaning |
|---|---|
| HSV-1 IgG positive | Past exposure to HSV-1 (often from childhood) |
| HSV-2 IgG positive | Past exposure to HSV-2 (usually genital) |
| Both negative | No detected exposure to either type |
| IgM positive | Possible recent infection — needs interpretation |
Limitations
- Antibodies take 3-12 weeks to develop after first infection — early infection may be missed
- A positive result doesn’t tell you when or how you were infected
- Most people are HSV-1 positive from childhood — a positive result is common
- False positives at low antibody levels are possible
- The result doesn’t predict whether you’ll have outbreaks
- Doesn’t help guide treatment in most cases
Why the UK Doesn’t Routinely Offer It
UK sexual health guidelines generally don’t recommend routine herpes antibody testing because:
- A positive result can cause significant distress without changing management
- It doesn’t differentiate symptomatic from asymptomatic infection
- Treatment is the same whether you know you have herpes from a swab or from a blood test
- False positives complicate the picture
When Blood Testing Might Be Useful
- Couples planning pregnancy where one partner has known herpes
- People with atypical symptoms when swab testing isn’t possible
- Specific clinical scenarios in pregnancy
- Personal preference for clarity (with informed consent)
Swab Testing Is Usually Better
If you have an active blister or ulcer, a swab from the lesion is more accurate than a blood test. PCR testing identifies the virus directly and tells you the type.
Home Herpes Blood Tests
Home blood tests for herpes antibodies exist but share the same limitations as clinic blood tests. They can be useful in specific situations but aren’t a routine recommendation.
If You Get a Positive Result
- Don’t panic — herpes is very common and manageable
- Discuss with a sexual health clinician
- Most people with HSV antibodies have no or mild symptoms
- Antiviral treatment is available if needed
Read more: What is herpes? | Home herpes tests | Herpes early detection
Frequently Asked Questions
Can I ask for a herpes blood test?
Yes, but most UK clinicians don’t recommend it routinely. They’ll discuss whether it makes sense for you.
Does a positive blood test mean I have genital herpes?
Not necessarily. HSV-1 antibodies are very common from childhood and may have nothing to do with genital infection.
How accurate are herpes blood tests?
Better than they used to be, but false positives at low levels are still possible.
Related reading
- Comprehensive Test: Chlamydia, Gonorrhoea and Herpes
- Home Herpes Tests: A Guide to Testing at Home
- Herpes Early Detection Testing
- Herpes PCR Test
- Lab Test for Syphilis and Herpes
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
