STI testing at home: chlamydia, gonorrhoea and syphilis symptoms, when to test and results

STI testing is routine healthcare. The useful questions are which infections were checked, which body sites were sampled and whether the timing was appropriate. A negative result is only as broad as the test behind it. This guide explains the difference between clinic investigations and rapid home screens, with free NHS routes and urgent situations clearly signposted.

Can you have an STI without symptoms?

Yes. Many sexually transmitted infections cause no obvious symptoms, so feeling well does not establish that an infection is absent. Symptoms can also be mild, delayed or confined to one site. NHS: Sexually transmitted infections; NHS: Chlamydia; NHS: Gonorrhoea; NHS: Syphilis

Testing decisions should consider exposure, partners and the type of sex, not simply whether discharge or pain has appeared. A partner's diagnosis is a reason to contact a clinic even if you have noticed nothing unusual. Staff discuss these issues routinely and can help without judgement.

Contact a sexual health clinic if you think you may have an STI, a partner has one or you are worried about an exposure. Do not wait for symptoms before asking about testing. If you develop severe pelvic pain, testicular pain or significant illness, seek urgent medical help rather than starting with a retail kit.

What symptoms can chlamydia cause?

Chlamydia may cause no symptoms. When symptoms occur, they can include unusual discharge, burning when passing urine, bleeding after sex or between periods, lower abdominal discomfort or testicular symptoms. NHS: Chlamydia

Throat, rectal and eye symptoms can also occur after exposure at those sites. The pattern is not reliable enough to diagnose an infection, and a genital sample does not automatically answer questions about the throat or rectum.

Contact a sexual health clinic or GP about possible chlamydia or a partner's infection. Ask the service which samples are appropriate rather than using a swab at an unlisted site. Severe pelvic or testicular pain needs urgent assessment; do not wait for a home result or a symptom to persist for a particular number of days.

What symptoms can gonorrhoea cause?

Gonorrhoea may cause discharge, burning when passing urine, lower abdominal or testicular discomfort, but some people have no symptoms. Infection can involve the throat, rectum or eyes as well as the genitals. NHS: Gonorrhoea

A symptom such as a sore throat cannot identify gonorrhoea by itself. Tell the clinic about the sites exposed so testing is targeted appropriately. The diagnosis and treatment should not be guessed from whether symptoms resemble chlamydia or a UTI.

Contact a sexual health clinic or GP if infection is possible. NHS guidance advises urgent GP or NHS 111 help for suspected gonorrhoea with eye symptoms, fever, joint pain or swelling, or a concerning rash. Severe pelvic or testicular pain also needs prompt medical assessment rather than waiting for a kit.

What symptoms can syphilis cause?

Syphilis can produce a painless sore, later a rash or other symptoms, but changes may be mild and easy to miss. Symptoms can improve without the infection having been treated. NHS: Syphilis

An antibody screen is not the same as checking whether a visible sore has a particular cause. Antibodies may remain after previous treatment BASHH: UK guidelines for the management of syphilis 2024, so the service needs your treatment history as well as any new exposures and symptoms.

Contact a sexual health clinic promptly if you or a partner may have syphilis, especially during pregnancy or when planning pregnancy. Do not wait for the sore to return or interpret its disappearance as recovery. A positive or concerning screen needs clinical follow-up, and an early negative cannot exclude every recent exposure.

What is a testing window and how is it different from symptoms?

A testing window is the time after exposure before a particular assay can provide useful information. It is different from the time symptoms appear and from how long the device takes to produce a reading. NHS: Testing for STIs: window periods

The Hampshire NHS service gives these examples for its testing pathway. They are not validated windows for U-Test rapid kits.

Different assays and circumstances can require different advice. Ask the testing service for its current instructions rather than treating any online table as a universal all-clear date.

When should you seek urgent prevention advice?

Recent possible HIV exposure needs urgent advice about PEP, not a wait for a screening window. NHS guidance says PEP must be started within 72 hours, with prompt assessment important. NHS: HIV and AIDS: post-exposure prophylaxis

Contact a sexual health clinic or A&E immediately if this may apply. Explain when the exposure happened and the circumstances. The service decides whether PEP is appropriate; do not assume a retail kit can assess the need. The U-Test products described in this guide do not check HIV.

If pregnancy is possible and not wanted, seek emergency contraception advice promptly from a pharmacist or sexual health service. After sexual assault, specialist services can provide medical care and support without requiring an immediate decision about police reporting. Do not delay time-sensitive care to order a test or wait for symptoms.

Which body sites and infections need testing?

The relevant sample depends on the exposure and the infection being investigated. A genital sample cannot be treated as a complete throat, rectal and genital assessment. NHS: Sexually transmitted infections; NHS: Chlamydia; NHS: Gonorrhoea

Tell the clinic about oral, vaginal and anal contact, symptoms and any partner's diagnosis. This helps determine whether urine, blood or site-specific swabs are needed. You can ask why each sample is recommended and what it will not check.

Do not use a retail swab at a body site unless the supplied leaflet explicitly permits it. A kit listing two infections does not cover HIV, hepatitis or every other STI. Seek clinic advice if symptoms persist or your exposure involves a site the kit does not cover, even when a home result is negative.

What can the U-Test rapid kits check?

The combo kit screens for chlamydia and gonorrhoea only, using the swab sample permitted by its leaflet. The separate finger-prick syphilis kit screens syphilis antibodies.

Use the leaflet for reading times and interpretation. NHS testing is free and should be considered alongside paid options. Symptoms or a known contact are reasons for clinical advice rather than relying on a rapid screen.

What should you do after a positive home result?

Contact a sexual health clinic promptly for assessment, appropriate confirmatory testing and treatment advice. A rapid result is not a prescription or enough information to choose an antibiotic. NHS: Sexually transmitted infections; NHS: Chlamydia; NHS: Gonorrhoea; NHS: Syphilis

Tell the service which kit you used, when the sample was taken, the body site and any previous treatment. A syphilis antibody result particularly needs treatment history because antibodies may persist. BASHH: UK guidelines for the management of syphilis 2024 Do not use leftover medicine or assume the treatment for another infection is suitable.

Ask the clinic about sex, partner notification, follow-up and any repeat testing. It can help contact partners without naming you. Seek urgent GP or NHS 111 advice for fever, significant pelvic pain or gonorrhoea-related eye or joint symptoms. Go to A&E for sudden severe testicular pain. Call 999 or go to A&E if pelvic pain is severe or worsening, or if pelvic pain occurs with faintness, collapse, shoulder-tip pain or heavy vaginal bleeding. Do not wait for a test result. NHS: Pelvic pain

What if a negative result does not fit the situation?

A negative screen cannot exclude infections outside its scope, an untested site or an exposure too recent for that assay. Symptoms still need assessment. NHS: Sexually transmitted infections; NHS: Testing for STIs: window periods

Tell the clinic about the result but also why you remain concerned. The next step may be another sample, another assay or repeat testing at an appropriate interval. Do not interpret one negative as proof that a partner's diagnosis is irrelevant or that all sexual contact is now risk-free.

Contact a sexual health service if symptoms persist, a partner has an STI or you tested before the advised window. Seek urgent care for severe pain or significant illness. Recent possible HIV exposure still needs urgent PEP advice within 72 hours, regardless of a negative result from these unrelated kits. NHS: HIV and AIDS: post-exposure prophylaxis

How do free NHS services and partner support work?

NHS STI testing is free and confidential. Services can select the correct tests, explain results and arrange treatment and partner advice. Some areas also offer free home sampling, with local eligibility rules. NHS: Find STI testing and treatment

Ask how appointments are arranged, how results will be sent and who can access the information. Staff can explain confidentiality and any safeguarding limits. You can request a clinician of a particular sex or ask about having a supportive person present.

After a diagnosis, the clinic can advise partners about testing and treatment, including confidential notification support. Follow its advice about avoiding sex and when it is safe to resume. Partner notification is about care and reducing transmission, not assigning blame or establishing exactly when an infection was acquired.