A new partner can be exciting, but it can also bring up a very practical question: what sexual health tests should you get? The best tests after a new partner depend on the sex you had, whether condoms or dental dams were used, any symptoms, and when the contact happened. Testing is not about mistrust or blame. It is a normal way to look after yourself and the people you have sex with.
Many sexually transmitted infections (STIs) have no obvious symptoms. You can feel completely well and still pass an infection on. A routine check gives you clarity, helps protect your partner or partners, and means treatment can start quickly if it is needed.
The best tests after a new partner
For most sexually active adults, a comprehensive STI screen is the most useful starting point after sex with a new partner. It commonly checks for chlamydia, gonorrhoea, syphilis and HIV. Depending on your circumstances, a clinician may also recommend testing for hepatitis B or hepatitis C.
The right sample matters as much as the right test. A urine sample can detect some infections, but it does not test every body site. If you have had oral or anal sex, throat or rectal swabs may be needed, even if you have no symptoms. Be open about the types of sex you have had so your testing can be matched to your actual risk. This is standard medical information, not something to feel embarrassed about.
Chlamydia and gonorrhoea
Chlamydia and gonorrhoea are two of the most common STIs in Australia, and both often cause no symptoms. Testing may involve a urine sample, a vaginal swab, a throat swab, a rectal swab, or a combination of these.
If symptoms do occur, they can include unusual discharge, pain or burning when urinating, pelvic or testicular pain, bleeding after sex, a sore throat, rectal discomfort or discharge. Symptoms are a reason to test promptly, but waiting for symptoms is not a reliable strategy.
Testing is generally most accurate after enough time has passed for an infection to be detectable. For chlamydia and gonorrhoea, that is often around two weeks after contact. If you test earlier because you are worried, a negative result may need to be repeated after the relevant window period.
HIV and syphilis
HIV and syphilis are usually checked with a blood test. A blood test shortly after a new sexual contact can be useful as a baseline, particularly if you do not know your previous test status. However, it may be too early to rule out a recent infection completely.
Modern HIV tests detect infection earlier than older tests, but timing still matters. Syphilis can also take time to show up on blood testing. Your doctor can advise when repeat testing is appropriate based on the date of contact and the type of exposure.
If you have had a possible higher-risk HIV exposure within the past 72 hours, seek urgent medical advice about PEP, or post-exposure prophylaxis. PEP is time-sensitive and should be started as soon as possible. Do not wait for symptoms or test results before getting advice.
Hepatitis B and hepatitis C
Hepatitis B testing may be appropriate if you are unsure whether you are vaccinated, have not completed vaccination, or have had a potential exposure. Vaccination offers strong protection against hepatitis B, so it is worth checking your immunisation history if you are not sure.
Hepatitis C is less commonly transmitted through sex, but testing may be recommended where there has been blood-to-blood contact, certain sexual practices, shared injecting equipment, or other relevant risk factors. A clinician can help decide whether it belongs in your screening plan.
When should you test after a new partner?
There is no single testing date that suits every STI. Some infections can be detected relatively soon after exposure, while others need more time. That does not mean you need to panic or put off testing altogether.
A sensible approach is to book an initial check if you have symptoms, a condom broke, you had sex without a barrier method, you are unsure of a partner’s status, or you simply want reassurance. Tell the clinician when the contact happened. They can advise whether your results will be conclusive now or whether repeat testing is recommended later.
If your contact was very recent and you have no symptoms, you may be advised to wait roughly two weeks for chlamydia and gonorrhoea testing. HIV and syphilis testing may be done at the same time as a baseline, then repeated later if needed. This is not a failure of the test. It is simply how infection detection windows work.
Avoid taking leftover antibiotics before testing or treatment advice. Antibiotics can affect some results and may not treat the right infection. If you have been prescribed antibiotics for another reason, let the clinician know.
Symptoms mean you should not wait
Book a test as soon as possible if you notice burning when urinating, new discharge, sores, blisters, a rash, pelvic pain, testicular pain, unusual bleeding, pain during sex, or rectal symptoms. These signs can have causes other than an STI, but they deserve proper assessment.
Some symptoms need urgent care. Severe lower abdominal or pelvic pain, swollen or painful testicles, fever with genital symptoms, or rapidly worsening pain should be assessed urgently. If you are pregnant, think you may be pregnant, or have a new STI concern, seek medical advice promptly because testing and treatment choices may need to be tailored.
It is also possible to have herpes or human papillomavirus (HPV) without a routine screening test being included in a standard STI panel. Herpes testing is generally most useful when there is a fresh sore or blister that can be swabbed. HPV is managed differently and is not usually checked through a general STI blood or urine test. If you have visible changes, sores or ongoing concerns, ask for clinical advice rather than relying on a standard screen alone.
What to do while you are waiting for results
Until you have clarity, using condoms and dental dams can reduce the risk of passing on many STIs. They do not remove all risk, particularly for infections spread by skin-to-skin contact, but they remain an effective part of safer sex.
If you have symptoms or are waiting on results after a possible exposure, consider pausing sex or using barriers consistently. If a result comes back positive, recent sexual partners may need testing and, in some cases, treatment. That conversation can feel awkward, but it is an act of care, not an accusation.
You do not need to provide every personal detail to a partner immediately if you are still waiting for answers. Focus on facts when you do talk: you have had a check, you are following medical advice, and you want both of you to be well. If treatment is needed, follow the instructions carefully and ask when it is safe to resume sex.
Make testing part of a new relationship routine
A new relationship is a good time to talk about testing, contraception, condoms and what helps each person feel comfortable. Ideally, this happens before sex, but it is never too late to have the conversation. Plenty of people test between partners or at regular intervals because it is routine healthcare, not because something has gone wrong.
For people with new or multiple partners, regular testing can be more useful than only testing after a scare. How often depends on your sexual practices, the number of partners, condom use, past STI history and whether you use HIV prevention medication such as PrEP. A doctor can help you work out a schedule that makes sense for you.
STI Clinic Australia makes it possible to request a pathology referral online, attend a major pathology collection centre, and have results medically reviewed without the awkward waiting room experience. For Medicare card holders, eligible testing may also be bulk billed.
Taking control of your sexual health should be simple, discreet and stress-free. A test after a new partner is not a statement about your choices. It is a practical step towards feeling informed, cared for and ready to enjoy your relationships with more confidence.