MARYLEBONE DIAGNOSTIC CENTRE · PRIVATE SEXUAL HEALTH TESTING
Private STI testing in London: how often should you test with new or different partners?
Looking for private sexual health testing after a new partner, before a collaboration or as part of your regular routine? Start with the tests, samples and timing that fit your sexual contact.
At Marylebone Diagnostic Centre, 73 Baker Street, you can enquire about sexual health testing or a combined general health and sexual health profile.
By Tharb Faisl — Writer / Scientist · 5-minute read
Quick answer
There is no single testing schedule for everyone with different partners. Your sexual contact, symptoms, known exposures and the tests used determine when to test. More frequent screening may be appropriate, but testing more often than monthly is not a universal recommendation.
A negative result cannot exclude every recent infection or cover sexual contact after the sample was taken. Ask for a testing plan that accounts for these limits.
Is monthly or three-monthly STI testing enough?
Regular screening and testing after a specific exposure are different decisions. Even if you have a routine schedule, a partner’s diagnosis or new symptoms should prompt advice sooner.
For example, Sexual Health London advises that people with a higher chance of acquiring HIV may benefit from testing every three months. The appropriate interval for other infections and circumstances may differ. A clinician can help decide whether you need earlier testing or a repeat after the window period.
For adult performers, a production’s testing requirements may set a separate schedule. Confirm the exact panel, sample sites, report identification and accepted sample dates before booking. A work requirement does not remove the clinical limits of a negative test.
Sources: Sexual Health London: HIV testing ; CDC: choosing STI tests and frequency .
Can you rely on a partner’s negative STI result?
A result is useful information, but it is not a guarantee. With your partner’s consent, clarify these four points:
When was the sample taken?
The sample date matters. Sexual contact since that date is not covered by that result.
What was actually tested?
“Full screen” can mean different things. Check the named infections rather than assuming everything was included.
Which sites were sampled?
A urine test does not replace throat or rectal testing when those sites need assessment.
Was it too soon?
A recent infection may not yet be detectable. An early negative result may need repeating.
You can postpone sexual contact or a collaboration if you are uncomfortable. Discuss boundaries privately; sharing someone’s medical report publicly is not a substitute for managing an exposure.
How soon after sex should you test?
The time between acquiring an infection and a test being able to detect it is called the window period. Timing depends on the infection and testing method.
For its service, Sexual Health London lists testing from two weeks for chlamydia and gonorrhoea, 45 days for HIV and three months for syphilis. These are examples, not a timetable for every assay. Ask MDC to confirm the window for the specific test you book.
Do not wait for a window period to pass if you have symptoms or a partner has tested positive. Seek clinical advice now; early assessment and later repeat testing may both be needed.
Source: Sexual Health London: window periods .
Possible HIV exposure within the last 72 hours?
Seek urgent assessment for PEP through a sexual health clinic or A&E. It needs to start as soon as possible, within 72 hours. Do not wait for a routine booking or test result.
Which private sexual health test should you book at MDC?
STI testing for a specific need
If your priority is repeat screening, a recent exposure or a particular infection, start with MDC’s sexual health services. Tell the team about symptoms and relevant contact so the appropriate assessment can be arranged.
View MDC sexual health testingSexual health and general health together
If you also want a broader health check, explore the Complete Health & Sexual Health Profile. Ask the team to confirm the included tests, suitable samples and preparation.
View the combined health profileYou do not automatically need the combined profile at every repeat STI screen. The right choice depends on the question you need answered.
Cost and results: Check the relevant service page or contact MDC for current pricing and expected turnaround. Confirm any separate consultation, treatment or follow-up charges before booking.
Your MDC testing pathway
- Enquire: Explain whether you want routine screening, assessment after an exposure or a report for work. Mention symptoms promptly.
- Confirm your appointment: Check the panel, sample sites, timing, preparation, price and how results will reach you.
- Attend for samples: Blood, urine or swabs may be needed, depending on the tests selected.
- Plan the next step: An early negative may need repeating. A positive or unclear result may require confirmation, clinical review, treatment and advice for partners. Ask MDC which follow-up is provided and what needs referral.
Privacy, preferred names and coded samples
You can request a preferred name and ask whether your samples can use a code instead of your name. Staff must confirm what is possible for the laboratory and report you require.
Coded samples are not the same as a fully anonymous medical record: a secure link may be necessary for identification and follow-up. If a production requires a named, identity-verified report, discuss this before collection.
Quick answers: private STI testing
Should I test after every new partner?
A new partner is a reason to review your testing needs. Agree timing around the contact and window periods; a test immediately afterwards cannot rule out every new infection.
Can I have an STI without symptoms?
Yes. Feeling well does not rule out an STI. Screening can be appropriate even when you have no symptoms.
Is a urine test enough after oral or anal sex?
Not necessarily. Ask whether throat or rectal swabs are appropriate as well as genital testing.
What if a partner tells me they tested positive?
Seek clinical advice promptly and pause sexual contact until advised. You may need assessment or treatment before your own results are available.
Can OnlyFans creators and performers book?
Yes, you can enquire with MDC. Send any required test list before booking so the team can confirm whether the service and report meet your needs.
Does frequent testing replace protection?
No. Testing detects infections; it does not prevent exposure. Condoms and other appropriate prevention measures still matter. Discuss HIV PrEP and relevant vaccinations with a sexual health clinician.
Further reading: NHS: sexually transmitted infections .
Arrange private STI testing at MDC, Baker Street
Marylebone Diagnostic Centre
73 Baker Street, London W1U 6RD
Use Baker Street station for nearby Underground access, then follow walking directions to number 73. Contact the team before travelling to confirm your appointment and any access requirements.
Not sure which test to choose? Ask MDC to help you identify the appropriate booking and whether you need a consultation first.
