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.

Finishing treatment for chlamydia is a good step. Many people then wonder what comes next. Do you need another test right away? Should you wait? Does it matter if your partner was treated too?

This guide covers the follow-up part only: when testing for chlamydia again makes sense after treatment, how to plan it, and where to go in Boston. It does not replace advice from the clinician who treated you. That clinician knows your history and can adjust anything here.

The short version

The CDC STI Treatment Guidelines (2021) separate two different follow-up tests. People often mix them up.

A test of cure checks whether treatment worked. The CDC does not recommend it for most non-pregnant people who took a recommended treatment. Pregnancy is a main exception.
A retest checks for a new infection after treatment. The CDC recommends one about three months after treatment for people who were treated for chlamydia.

The rest of this page walks through how to handle each one.

What you need before you start

You do not need special supplies. A little information makes the visit smoother.

The date you finished treatment. Your pharmacy receipt or patient portal usually shows it.
The name of the medication a clinician prescribed, if you have it. You do not need to know anything else about it.
A rough list of the sexual partners you have had since treatment, and whether each was treated. You do not have to share names with a clinic. Counts and timing are enough.
Your insurance card, if you have one. Some Boston clinics offer free or sliding-scale testing, so ask before assuming a cost.
A phone and your calendar, so you can book the retest before you leave the first visit.

Step 1: Confirm which kind of follow-up applies to you

Start by sorting yourself into one of these groups. The CDC guidelines handle them differently.

Most non-pregnant adults and teens

The CDC does not recommend a test of cure for people who took a recommended treatment and whose symptoms resolved. It does recommend a retest about three months later, because getting chlamydia again is common and a repeat infection can happen without symptoms.

People who are pregnant

The CDC recommends a test of cure about four weeks after treatment for pregnant people. It also recommends a retest within three months. If you are pregnant, tell the clinic at the start so they can plan both.

People whose symptoms continue, or who may not have finished treatment

If symptoms continue after treatment, or you missed part of the course, call the prescribing clinic. A clinician can decide what testing or treatment makes sense. Do not wait for the three-month mark in that case.

Step 2: Do not test too early

This is the most common mistake. Chlamydia tests used today look for genetic material from the bacteria. The CDC notes that this material can linger after treatment even when the infection has been treated. A test taken too soon can therefore come back positive without telling you anything new.

The CDC guidance for a test of cure is to wait about four weeks after treatment. For a routine retest, the CDC's three-month mark exists for a reason. It gives enough time to find a new infection without confusing it with leftover material.

If you took a test sooner than that, such as a home result or an urgent care visit, bring it up with a clinician rather than guessing what it means.

Step 3: Be clear about sex and partners after treatment

A retest is only useful if you also reduce the chance of passing chlamydia back and forth. The CDC advises people to avoid sex until treatment is complete and until their partners have been treated too. Your clinician will give you the exact timing for your situation.

Why this matters: if a partner was not treated, they can pass the bacteria back to you after you finish treatment. This is one of the main reasons the CDC recommends a retest at all.

In Massachusetts, a clinician may be able to help your partners get treatment without a separate visit. Under M.G.L. c. 111, s. 121B, the state health department can issue rules for expedited partner therapy. The CDC's page on the legal status of expedited partner therapy in Massachusetts lists chlamydia under the state regulation. Ask the clinician who treated you whether this is available in your case.

Step 4: Book the retest before you forget

A three-month gap is easy to lose track of. Put a reminder in your phone on the day you finish treatment. Set it for slightly before the three-month date, so you have time to get an appointment.

If you cannot make it exactly at three months, go when you can. The CDC guidance also says to test whenever you are next seen within the first year after treatment, even if it is not at the three-month mark.

Step 5: Choose where to go in Boston

Several Boston clinics offer STI testing. The details below come from each clinic's own page. Hours and services can change, so call before you go. For a wider list, see our guide to STD testing in Boston and what it costs, or the local testing list.

Boston STD Clinic (Boston Medical Center): 725 Albany St., 9th Floor, Suite 9C, 617-414-2803. The clinic's page describes free routine testing for chlamydia, gonorrhea, syphilis, HIV and hepatitis C, with cost help for people without insurance. It lists appointments by phone, and it does not say whether walk-ins are accepted. Clinic page.
Fenway Health Sexual Health Clinic: 1340 Boylston Street, 4th floor, 617-267-0159. Fenway's page lists walk-in hours on Tuesday through Friday and appointment-only hours on Monday, and says results take 3 to 5 business days. It bills insurance if you have it, and says people without insurance can be seen free through grant funding. Its page is aimed at gay, bisexual and other men who have sex with men, transgender and gender diverse people, and their partners. Clinic page.
X-Clinic at Codman Square Health Center: 637 Washington St., Dorchester, 617-822-8350. Codman's page says express visits for people with no symptoms and no known exposure are walk-in, and that it uses a sliding fee schedule. Its two pages list different hours, so call to confirm. Clinic page.
TrueCare@MAC testing (Multicultural AIDS Coalition): 9 Palmer Street, Roxbury, 617-442-1622. The coalition's page lists free testing with or without an appointment, with testing hours most days including Saturday. Coalition page.

You can also call the Mayor's Health Line at 617-534-5050. The City of Boston describes it as a free, confidential, multilingual line for health information and referrals.

Tell the clinic at check-in that you were treated for chlamydia and when. That lets them handle your visit as a retest.

Step 6: Understand privacy and age rules

If you are under 18, Massachusetts law may allow you to get care without a parent. 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. The City of Boston's testing page tells people 13 or older that they can get a confidential STI test without parental permission.

On records, M.G.L. c. 111, s. 119 makes venereal disease reports and records non-public, with limited exceptions such as a judicial order. Ask the clinic how it handles billing statements if that is a concern for you.

Step 7: Follow up on the result

Ask how and when you will hear about the result. Some places call, others use a patient portal. Fenway's page, for example, lists results in 3 to 5 business days.

If the result is positive, a clinician can talk with you about treatment. Chlamydia is curable with treatment from a clinician, and many people are treated more than once in their lives. A repeat result does not say anything about you as a person.

Expected results

No test is perfect, so here is what you can reasonably expect.

A negative retest at about three months can suggest that no new infection was detected at the time of the test. A clinician can tell you what that means for your situation.
A positive retest may mean a new infection, for example from an untreated partner. It can also reflect other causes, so a clinician should interpret it with your timeline in mind.
A positive test taken within the first few weeks after treatment may reflect leftover genetic material. This is why the CDC advises waiting.

Tips

Ask your partners to get treated at the same time as you. This is the single most useful step for avoiding a repeat infection.
Keep the treatment date in a note on your phone.
Ask your clinician whether testing at other body sites makes sense for you. This depends on the kinds of sex you have.
Bring up any new symptoms. Do not wait for the three-month mark.
Ask about testing for other infections at the same visit. Many Boston clinics offer HIV, syphilis and hepatitis C testing alongside chlamydia testing.

Common mistakes to avoid

Testing within days of finishing treatment. Leftover genetic material can cause a confusing result.
Skipping the retest because you feel fine. Chlamydia often has no symptoms, so feeling fine does not tell you what a test would show.
Resuming sex before partners are treated. This is how many repeat infections happen.
Stopping treatment early. If side effects or cost are a problem, call the prescribing clinic. Do not simply stop.
Assuming one clinic's schedule is current. Several Boston clinics have hours that vary by day. Call first.

Why retesting matters in Boston

According to CDC county data republished by Boston 25 News in March 2024, Suffolk County, which includes Boston, had a 2021 chlamydia rate of 807.8 per 100,000 people, the highest in Massachusetts. That figure covers the whole county and not only the city. With that much chlamydia in circulation, a retest is a practical step. A partner who has not been treated can pass it back.

Frequently asked questions

Do I need a test of cure?

The CDC does not recommend one for most non-pregnant people who took a recommended treatment. Pregnancy and ongoing symptoms are the main reasons a clinician may suggest one.

Is three months a hard deadline?

No. The CDC also advises retesting whenever you next see a clinician within the first year after treatment.

What if I cannot afford a visit?

Several clinics above list free or sliding-scale options. Call and ask. If a price is not on a clinic's page, check with the clinic directly.

Testing for Chlamydia After Treatment: When to Retest