Clear guidance on STI testing: which tests you need, when to test after exposure, how results are interpreted, and what happens next. Private clinic at 101 Harley Street.
Making the decision to get tested is an important and responsible step in looking after your sexual health. Many people feel uncertain about what STI testing involves, which tests they actually need, how long to wait after a potential exposure and how to make sense of their results. This guide aims to answer those questions clearly and without unnecessary jargon.
At The Wright Practice, our goal is not simply to provide testing but to ensure that you have a thorough understanding of what you are being tested for, why and what your results mean. For a full overview of our sexual health services, see Sexual Health and for information on our comprehensive screening packages, see Comprehensive STI Screening
STI testing is generally straightforward, quick and involves minimal discomfort. Depending on which infections are being screened for and which anatomical sites may have been exposed, your appointment may involve one or more of the following:
Not all of these will be necessary for every patient. Your clinician will advise on which samples are appropriate based on your individual circumstances. Many people are surprised to learn that a comprehensive screen may require swabs from more than one anatomical site, particularly when oral or anal contact has occurred.
A comprehensive STI screen at The Wright Practice may include testing for:
Which of these is relevant to you will depend on your specific history, risk factors and the nature of any exposure. Your clinician will guide you through this at your consultation.
There are two broad categories of test used in sexual health screening, and understanding the difference is helpful when interpreting results.
PCR testing detects the genetic material of a pathogen directly. It is highly sensitive and specific, meaning it is very accurate at detecting infections that are genuinely present and very unlikely to produce a false positive. PCR testing is used for bacterial infections such as chlamydia, gonorrhoea, Mycoplasma genitalium and Trichomonas vaginalis, as well as for viral infections including herpes simplex virus and, in certain circumstances, HIV (RNA PCR).
PCR tests become positive relatively quickly after infection, often within days to one or two weeks depending on the infection. This makes them suitable for detecting recent exposures, though window periods still apply.
Antibody tests detect the immune system’s response to an infection rather than the infection itself. Because the immune system takes time to mount a measurable response, antibody tests have a longer window period than PCR tests. HIV testing now typically uses fourth-generation combination tests that detect both HIV antigens (the p24 protein) and antibodies, significantly shortening the window period compared to older antibody-only tests.
Antibody testing is used for HIV, syphilis, hepatitis B and hepatitis C. Understanding which type of test has been used is important when interpreting a negative result, particularly in relation to timing.
The window period refers to the time between a potential exposure and when a test can reliably detect the infection. Testing during the window period may produce a false-negative result even if infection is genuinely present. Window periods vary between infections and between test types. As a general guide:
These are approximate figures and individual circumstances may vary. Your clinician will advise on the most appropriate timing for your specific situation. For early detection testing for HIV and hepatitis, see Early HIV & Hepatitis Detection Tests
Preparation requirements vary depending on which tests are being performed, but the following general points are helpful:
A negative result means that the specific infection tested for was not detected in the sample provided at the sensitivity level of the test used and at the time of testing. It does not rule out a very recent exposure that falls within the window period.
A positive result means that the specific infection was detected. A positive result does not need to cause alarm. The vast majority of STIs are either curable with appropriate antibiotic treatment or, where not curable, highly manageable with modern medicine. Your clinician will explain what a positive result means for you specifically, what treatment is recommended and whether any partners should be informed.
An equivocal or borderline result may occasionally require repeat testing or a confirmatory test. Your clinician will advise clearly on next steps in this situation.
Once your results are available, your clinician will contact you to discuss them. If all results are negative and no follow-up is required, you will be advised accordingly. If any results are positive, a follow-up consultation will be arranged to discuss treatment, partner notification and any additional investigations that may be needed.
For those who have been potentially exposed to HIV within the past 72 hours, post-exposure prophylaxis (PEP) may be available. For information on PEP, see HIV PEP For those wishing to reduce their ongoing risk of HIV, pre-exposure prophylaxis (PrEP) may be worth discussing. See Pre-Exposure Prophylaxis for further information.
For patients who would prefer to begin the testing process from home, self-sampling options are available. See Home STI Testing for further details.
A negative result is reassuring, but it must always be interpreted in the context of timing. If you were tested within the window period for a specific infection, a negative result may not be conclusive, and a repeat test after the window period has passed may be recommended. Your clinician will advise on whether any repeat testing is necessary.
This depends on the type of sexual contact you have had. Infections such as gonorrhoea frequently infect the throat and rectum without causing any symptoms. If oral or anal contact has occurred, site-specific swabs from those locations are recommended in addition to genital or urinary testing. Testing only urine or genital swabs may miss infections elsewhere.
Self-sampling options are available and can be appropriate in certain circumstances. For more information, see Home STI Testing However, for more complex assessments, recent exposures or where symptoms are present, attending in person allows for a more thorough evaluation and personalised advice from the clinical team.
The answer varies depending on the specific infection. Testing too soon may produce a false-negative result. As a general guide, a minimum of two weeks is often recommended for bacterial infections such as chlamydia and gonorrhoea, while a definitive negative for HIV requires testing at 45 days (fourth-generation test). Your clinician will advise on the most appropriate timing for your circumstances.
STI testing is generally very straightforward and involves minimal discomfort. Blood tests involve a standard blood draw. Urine tests require only a urine sample. Swabs are generally well tolerated and take only a few seconds to collect.
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101 Harley Street, London, W1G 6AH
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