This page is general health information, not medical advice. It cannot tell you whether you have an infection. A clinician can, and the testing options on this site are a good place to start.

Herpes is common, manageable and often misunderstood. The CDC says genital herpes is caused by two viruses, herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2). Many people who carry either virus never notice anything.

This guide explains how herpes testing works, which herpes test fits which situation, and what the results can and cannot tell you. It also covers where to start in Boston.

The short version

A swab of a sore is the most useful herpes test when there is a sore to sample.
A blood test looks for antibodies. It can help in specific situations, but it cannot show where on the body the virus is or how long ago it was acquired.
The CDC STI Treatment Guidelines (2021) do not recommend routine herpes blood screening for people with no symptoms. The U.S. Preventive Services Task Force (USPSTF) also recommends against routine screening for genital herpes in adolescents and adults without symptoms.
Herpes is not curable, but it is treatable. A clinician can prescribe antiviral medicine for outbreaks and for ongoing suppression.

Herpes symptoms: what people notice

The CDC says most people with genital herpes have no symptoms or very mild ones. Mild symptoms are easy to mistake for a pimple, an ingrown hair, a yeast infection or razor irritation.

When herpes symptoms do appear, the CDC describes them as one or more blisters or sores on or near the genitals, rectum or mouth. The blisters can break and leave tender ulcers that heal over a few weeks. Some people also have flu-like symptoms, swollen glands, or tingling and itching before a sore appears.

Symptoms alone cannot confirm herpes. Other conditions, including syphilis, can cause sores that look similar. A clinician and a test can sort out what is going on.

HSV-1 and HSV-2: why the type matters

Both viruses can cause sores on the mouth or the genitals. According to the CDC, HSV-1 is the usual cause of oral herpes (cold sores). It can also be passed to the genitals through oral sex. HSV-2 is the more common cause of genital herpes.

The type matters because genital HSV-2 tends to cause outbreaks more often than genital HSV-1, according to the CDC. Knowing the type helps a clinician talk with you about what to expect.

Swab test versus blood test

Swab testing of a sore

A clinician gently samples fluid from a sore and sends it to a lab. The CDC guidelines favor a PCR (nucleic acid amplification) test on the sample because it is more sensitive than culture. It can also tell HSV-1 from HSV-2.

Timing matters. Sores heal, and a sample from a healed or nearly healed sore is more likely to come back negative even when the virus is present. A negative swab from a sore that has healed does not rule out herpes.

Type-specific blood tests

A blood test looks for antibodies your body makes in response to HSV-1 or HSV-2. The CDC guidelines say to ask for a type-specific test. Older tests that do not separate the two types are not useful for this purpose.

A blood test has real limits:

It cannot show where on the body the virus is. A positive HSV-1 antibody result could reflect an old oral infection rather than a genital one.
It cannot show when the infection happened.
Antibodies take time to develop, so a very early test can be negative even after exposure. The CDC guidelines note that false-negative results are more likely early on. A clinician can tell you when a repeat test makes sense.
Some results fall in a low-positive range, and the CDC guidelines note these can be false positives. Clinicians may suggest confirming with a second test.

Why CDC does not recommend routine blood screening

The CDC guidelines do not recommend routine HSV-2 blood screening for the general population. The reasons are practical. The tests can give false-positive results, a result cannot say where or when the virus was acquired, and finding the virus in people with no symptoms has not been shown to change outcomes the way screening for other infections does.

The CDC does say that type-specific blood tests can be useful in some situations. Examples are recurring or atypical symptoms with a negative swab, a clinical diagnosis of herpes that was never confirmed, or a partner who has genital herpes. A clinician can talk through whether a blood test makes sense for you.

Routine panels that test for several infections at once usually do not include herpes unless you ask. If you want a herpes test, say so directly.

How to get a herpes test: step by step

What to have ready

A short list of your symptoms and when they started.
The date of any recent sexual contact or a partner's diagnosis, if relevant.
Your insurance card if you have one. Insurance is not required at every clinic.
A list of medicines you take and any questions you want to ask.
A phone to call the clinic ahead, since hours and walk-in rules can change.

Steps

Decide whether there is a sore to sample. If you have a new blister or sore, try to be seen quickly, ideally within a day or two. A swab is most useful while the sore is fresh. If you have no symptoms, a clinician can talk with you about whether a test is worthwhile, given that the CDC and USPSTF do not recommend routine screening.
Pick a clinic. Start with the list of Boston clinics or the CDC's GetTested directory. The clinic pages we reviewed do not state whether each clinic offers herpes testing, so ask when you call. Many list testing for other infections such as chlamydia, gonorrhea, syphilis and HIV.
Call and ask three questions. Do you test for herpes? Is it a swab, a blood test, or both? Can I be seen soon because I have a sore? Ask about cost and walk-in hours at the same time.
Do not put anything on the sore before the visit. Skip creams and ointments if you can, and do not pick at the area. This keeps the sample usable.
Tell the clinician what you want to know. Say whether you want a herpes test and why. If you have a sore, say so even if it is small. Clinicians hear this every day.
Have the test. A swab takes a moment and may sting briefly. A blood test is a standard blood draw. You may also be offered tests for other infections. The CDC recommends that anyone with a genital sore also be considered for syphilis testing.
Ask when and how you will get results. Ask whether you will hear by phone, patient portal or visit. Fenway Health's page says results take 3 to 5 business days. Other clinics may differ.
Book the follow-up conversation. A result is only the start. A clinician can explain what it means for you and discuss treatment choices.

Tips and common mistakes to avoid

Waiting until a sore heals. A healed sore is hard to sample. If you can, get seen while the sore is present.
Assuming a standard STI panel includes herpes. It often does not. Ask by name.
Testing right after a possible exposure. Blood antibody tests can be negative early on. Ask a clinician about timing and whether to repeat the test.
Over-reading an HSV-1 blood result. A positive result cannot tell you whether the virus is on the mouth or the genitals.
Self-diagnosing from a photo or a symptom list. Several conditions look alike. A test and an exam are better guides.
Skipping other tests. If you are being tested for herpes, it is reasonable to ask about other infections too. Our guide to chlamydia symptoms, testing and treatment in Boston explains one of the most common.

What results can mean

No test is perfect, and results are best read with a clinician. Here is how the common outcomes are usually interpreted.

Result	What it may suggest	What to ask
Swab positive for HSV-1 or HSV-2	The virus was found in the sample from that sore, and the type is identified.	What does this type mean for outbreaks? What treatment options are there?
Swab negative from a sore	The virus may not have been detected. This can happen if the sore was healing or the sample was small.	Should I repeat the swab if a new sore appears? Is a blood test useful?
Blood test positive for HSV-2	Antibodies to HSV-2 were found, which suggests past exposure. It does not show when.	Should this be confirmed? What does it mean for my partners?
Blood test positive for HSV-1	Antibodies to HSV-1 were found. This is common, and it does not show whether the virus is oral or genital.	Does this change anything for me?
Blood test negative	Antibodies may not have been found. If exposure was recent, they may not have developed yet.	Is there a reason to repeat this later?

Whatever the result, a clinician can explain it. Ask for it in writing or through a portal so you can look back at it.

Managing outbreaks with a clinician

Herpes does not go away, but it is manageable. The CDC says outbreaks usually become less frequent over time, and the first outbreak is often the most noticeable.

A clinician may prescribe antiviral medicine in two ways. Episodic treatment is taken when an outbreak starts and can shorten it. Suppressive treatment is taken daily and can reduce how often outbreaks happen. The CDC also notes that daily suppressive therapy can lower the chance of passing HSV-2 to a partner, though it does not remove the chance completely.

Which approach fits depends on how often outbreaks happen, how they affect your life, and your partners. This is a decision to make with a clinician. Do not use leftover prescriptions or someone else's medicine.

The CDC lists other practical steps. Keep sores clean and dry, wear loose clothing if the area is sore, and ask a clinician about pain relief. Avoid sexual contact from the time you notice early symptoms until sores have fully healed.

Disclosure: talking with partners

Telling a partner can feel daunting. It may help to know that herpes is very common and that many people carry HSV-1 or HSV-2 without knowing it.

Choose a private, calm moment, not in the middle of sex.
Share the facts you have: the type, how it is managed, and what lowers the chance of passing it on.
Mention the tools the CDC lists. These include condoms, which lower but do not eliminate the risk, and suppressive therapy from a clinician. Avoiding sex during outbreaks also helps.
Give your partner time to ask questions and to talk with their own clinician.

Massachusetts law limits who sees your records. Under M.G.L. c. 111, s. 119, venereal disease reports and records are not public and are shared only on a judicial order or with officials whose duties entitle them. Ask the clinic how it handles your information if you have concerns.

Herpes testing options in Boston

Boston has several free and low-cost places for sexual health care. The pages for these clinics do not say whether they offer a herpes test, so call and ask before you go. Here is what each clinic's page says about its services and costs.

Boston STD Clinic (Boston Medical Center), 725 Albany St., 9th Floor, Suite 9C, Boston. Phone 617-414-2803. The clinic's page lists free routine testing for HIV, chlamydia, gonorrhea, syphilis and hepatitis C, and cost assistance for people without insurance. The page does not say whether walk-ins are accepted, so call for an appointment.
Fenway Health Sexual Health Clinic, 1340 Boylston Street, 4th floor, Boston. Phone 617-267-0159. Fenway's page lists walk-in hours on Tuesday, Wednesday, Thursday and Friday, and Monday by appointment. It says it bills insurance when you have it and that uninsured patients can be seen free through grant funding. The page says the clinic is open to gay, bisexual and other men who have sex with men, transgender and gender diverse people, and their partners.
X-Clinic at Codman Square Health Center, 637 Washington St., Dorchester. Phone 617-822-8350. The page lists walk-in express visits for people without symptoms or a known exposure, a sliding fee schedule, and testing and treatment regardless of citizenship status. Its two pages list different hours, so call to confirm.
TrueCare@MAC (Multicultural AIDS Coalition), 9 Palmer Street, Roxbury. Phone 617-442-1622. The page lists free testing, with or without an appointment.
Planned Parenthood League of Massachusetts, Greater Boston Health Center, 1055 Commonwealth Ave, Boston. Phone 617-295-7235. The CDC GetTested listing says an appointment is required and a sliding scale is offered.
DotHouse Health, 1353 Dorchester Avenue, Dorchester. Phone 617-288-3230. The CDC GetTested listing shows a sliding scale. Check by phone whether you need an appointment.

For a broader look at costs and what each visit involves, see our guide to STD testing in Boston: where to get tested and what it costs.

If you are not sure where to start, the City of Boston's Mayor's Health Line at 617-534-5050 offers free, confidential, multilingual health information and referrals. The City of Boston's Getting Tested for STIs page has more detail.

Testing as a teen

Massachusetts law (M.G.L. c. 112, s. 12F) lets a minor who reasonably believes they are at risk of exposure through sexual activity consent to care to diagnose or treat the disease without a parent's consent. The City of Boston tells people 13 or older that they can get a confidential STI test without parental permission. Records are confidential between the minor and the provider, with limited exceptions.

Next step

If you have a sore, try to be seen soon. If you have no symptoms and are curious, a conversation with a clinician is a good first step, since routine herpes blood screening is not recommended for most people. Either way, free and low-cost options exist in Boston. You can also use the CDC's GetTested directory to find a site by ZIP code.

Herpes Testing in Boston: Swab, Blood Tests and What the Results Mean