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At-Home HSV Testing: What the Tests Can and Cannot Tell You
A practical guide to HSV swab and antibody testing, including myLAB Box, LetsGetChecked and why SH:24 home kits do not test for herpes.
TECH & DIGITAL HEALTH
Giles
2/26/20265 min read
If you have a fresh blister, ulcer or sore, the most useful HSV test is usually a swab taken from the lesion as soon as possible. A mail-in finger-prick kit is different: it looks for antibodies in your blood, cannot confirm that a current sore is herpes and cannot show where or when you acquired HSV.
That distinction matters. The CDC recommends herpes testing for people with genital symptoms, but does not recommend routine blood screening for most people without symptoms because false-positive results can occur. This guide explains when an at-home antibody test may help, what myLAB Box and LetsGetChecked currently offer, and why SH:24 is not an at-home HSV test.
The quick decision guide
You have a new blister or sore: contact a sexual health clinic, GP or other qualified clinician promptly and ask about an HSV PCR/NAAT swab. Testing works best before a lesion crusts or heals.
Your partner has genital herpes, or a clinician suspects HSV but a lesion swab was unavailable or negative: a type-specific IgG blood test may be useful after discussing timing and limitations with a clinician.
You have no symptoms and only want a routine screen: routine HSV blood screening is not recommended for most people. A clinician can help you weigh your individual risk and the chance of a misleading result.
You were exposed recently: a negative antibody result can be too early. The CDC says detection can take up to 16 weeks or longer after exposure.
Swab tests and blood tests answer different questions
Lesion swab: the preferred test when symptoms are present
The CDC STI treatment guidance recommends confirming genital lesions with a type-specific virologic test, usually NAAT/PCR or culture. NAAT is the most sensitive option. A positive result can identify HSV-1 or HSV-2 at the sampled site.
A negative swab does not always rule HSV out, particularly if the lesion is old or healing, because viral shedding is intermittent and culture sensitivity falls as lesions heal. If you have symptoms, arrange clinical assessment promptly rather than waiting for a postal antibody kit.
IgG blood test: evidence of past exposure
A type-specific IgG test looks for antibodies to HSV-1 and/or HSV-2. It does not identify the body site, date of infection or person from whom HSV was acquired. An HSV-1 antibody result is especially difficult to interpret because it may reflect an oral infection acquired years earlier rather than genital HSV.
HSV IgM testing is not recommended. It is not type-specific and can be positive during recurrent oral or genital episodes.
Comparing the three services
myLAB Box
myLAB Box currently offers a US mail-in finger-prick test for HSV-2 IgG antibodies. Its product page lists an $89 price at the time of this review, but availability and pricing can change. The service states that results are processed by a laboratory and that a physician consultation is available on request.
Useful for: someone in the US for whom an HSV-2 antibody test is clinically appropriate and who understands that a reactive result may need confirmation.
Main limitations: it does not test for HSV-1, cannot diagnose an active lesion and does not offer the Western blot confirmatory test. A result near the assay cutoff should be discussed with a clinician.
LetsGetChecked
LetsGetChecked currently offers a mail-in finger-prick antibody test for HSV-1 and HSV-2, with online results. Its product page says results are generally available two to five days after the laboratory receives the sample. Check the product page for current regional availability and price.
Useful for: someone for whom type-specific serology is appropriate and who wants both HSV-1 and HSV-2 antibodies reported.
Main limitations: an HSV-1 result cannot identify whether infection is oral or genital. Both types can produce false-positive or early false-negative results, and a blood test cannot confirm that a current lesion is caused by HSV.
SH:24
SH:24 should not be presented as a home HSV testing kit. SH:24 states directly that its at-home STI tests do not test for herpes. Its postal kits cover other infections according to local eligibility. In some UK areas, SH:24 offers online assessment or treatment services for people with symptoms, but that is different from a laboratory HSV test.
If you have visible blisters or sores in the UK, contact a sexual health clinic or GP promptly. A clinician may be able to take a lesion swab. Do not order a general SH:24 STI kit expecting it to answer an HSV question.
How to interpret an HSV antibody result
A reactive result may need confirmation
The FDA warns that HSV-2 blood tests can produce false-reactive results, especially when testing is performed too soon, the person has a low likelihood of infection or the result is near the assay cutoff. CDC guidance recommends confirmation with a different method, such as Biokit or Western blot, for low-positive HSV-2 EIA results.
Ask for the test name and numerical index value rather than relying only on a positive/negative label. A clinician can advise whether repeat or confirmatory testing is appropriate. The University of Washington Western blot is a specialised confirmatory option and may require clinician-arranged sampling.
A negative result is not always final
Antibodies take time to develop. CDC clinical guidance advises repeat type-specific testing 12 weeks after suspected HSV-2 acquisition, while its public testing page notes that detection can take 16 weeks or longer. A negative result obtained soon after exposure cannot reliably exclude infection.
A negative HSV-1 blood test also has limits because type-specific HSV-1 serology is less sensitive. If symptoms are present, clinical examination and lesion testing matter more than a mail-in antibody result.
Questions to ask before ordering
Does this test report type-specific HSV-1, HSV-2 or both?
Is it an IgG antibody test? Avoid HSV IgM tests.
Will the laboratory provide the numerical index value?
What follow-up is available after a reactive or unclear result?
Does the provider offer confirmatory testing, or will you need to arrange it separately?
Is the service available in your country or state, and what is the current total price?
What to do next
If you have symptoms: seek clinical assessment while lesions are fresh. See our guide to genital herpes symptoms in men, but do not use photographs or an article as a diagnosis.
If a blood test is reactive: discuss the result, assay and index value with a qualified clinician before making treatment or disclosure decisions. Ask whether confirmation is needed.
If HSV is confirmed: treatment decisions depend on symptoms, recurrence pattern and personal circumstances. Our antiviral comparison explains the main options to discuss with a clinician.
At-home collection can be convenient, but the right test is more important than the location. A lesion swab and an antibody test answer different questions, and no provider can remove the need for careful interpretation.
Sources and review note
Information checked 21 September 2026. Service availability, turnaround and prices can change. This article is educational and is not a substitute for diagnosis or personalised medical advice.
For more on diagnosis, treatment and living with HSV, see The Modern Man's Guide to HSV: Volume I.
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