• Monday to Friday - 9:00 AM - 6:00 PM
  • Saturday to Sunday - 10:00 AM - 2:00 PM
  • Monday - Friday
    9:00 AM - 6:00 PM
  • Saturday - Sunday
    10:00 AM - 2:00 PM
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Offering same day STI Screening with absolute privacy guaranteed. Use a pseudonym and pay in cash with no appointment needed.
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Suite C, 117a Harley St, Marylebone,
London W1G 6AT, UK

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Monday - Friday

9:00 AM - 6:00 PM

Saturday - Sunday

10:00 AM - 2:00 PM

Welcome to
STI Clinic in London

Private Sexual Health (GUM) Clinic for Same Day STD testing

STI Clinic London - Outside

We are an established and discreet private sexual health (GUM) clinic located on Harley Street, in London. We offer the full range of sexual health screening services for both men and women, including individual testing, treatment and expert advice for any sexually transmitted infections (STIs) and sexually transmitted diseases (STDs).

As a walk-in STD clinic in London, we understand the importance of convenience and confidentiality when it comes to sexual health. Our team is committed to providing you with same-day appointments when needed and also same-day results for many of our STI tests. Your privacy is our priority, and we do not share your results with anyone. With us, you can also perform the test anonymously and pay in full cash for complete discretion.

At STI Clinic London, we only use gold standard lab-based PCR testing to deliver accurate results for diagnosing infections and determining the most suitable treatment options for your condition. Our experienced doctors engage in open, as well as confidential discussions to provide effective solutions for your any sexual health issues. We use the highest standard of testing and state-of-the-art treatment to ensure exceptional services for our patients. Our aim is not only to improve your health and wellbeing, but also to prevent the spread of infections or diseases to others.

If you're in London and need a nearby private clinic for same-day STI testing, we are the perfect choice for you! We have partnered with UKAS accredited laboratories for thorough analysis of collected samples by courier every hour for analysis. You may book an appointment online with our GP or simply walk-in to our clinic without any advance booking.

Don't let concerns about sexual health hold you back. Visit us at STI Clinic London for confidential, reliable, and professional sexual health services. Your sexual health is our priority. Book an appointment online or walk-in today for peace of mind.

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Get expert guidance and valuable advice
about sexual health concerns and testing options!

Book an appointment with doctors and get necessary sexual health tests done on time!

Put Your Mind at Ease Today OR Call 020 7183 0649

Why Choose STI Clinic

Reason to choose us as your private sexual health clinic in London

As a Harley Street’s premium private sexual health clinic, we have 35 years of experience to offer reliable and most effective services to the patients. Here’s what make us apart from other clinics in London:

blue list iconA Discrete Service

Discretion is at the core of STI Clinic. You will never have to give your real name or date of birth, and we also accept cash payments.  As well as members of the public, we also carry out routine sexual health testing for figures in the public eye, all with complete confidentiality, discretion and professionalism.

blue list iconAppointments to suit you

Planning to get tested for STD in London? We provide convenient same-day appointments and walk-in services without appointment for private STI testing. Our priority is to ensure you receive prompt and efficient service, without unnecessary waiting times. While we do recommend booking in advance to minimize any potential delays, we strive to accommodate your immediate testing needs. With our same-day STD screening services, you can get tested quickly and confidentially.

Results for you - fast

STI Clinic understand the sensitivity and the urgency you feel while you wait for your results. Particularly if those results are to do with a potential HIV infection. Above everything we have a very supportive and caring approach to all of our patients and we make sure that you get your results as fast as humanly possible. In the vast majority of cases, blood tests will be turned around within 24 hours. Urine tests and swabs will take up to 4 working days in order for the laboratory to properly grow the bacteria (culture) and detect which antibiotics will treat any infection (sensitivity). Once the results are in we will support you and offer you any appropriate treatment


When it comes to communication we can contact you in any way that you would like whether that is to discuss the results over the telephone or you may prefer to have them by e-mail. You just let us know your preference.

Cutting edge technology

We will have been working with our laboratory partners for over 20 years and we only use laboratories that are UKAS accredited so that we can be sure that the results can be relied upon.

We always like to remind our clients that not every sexually transmitted infection will have obvious symptoms. In fact many infections such as Hepatitis B, HPV, HIV and Chlamydia can have no symptoms at all, so if you are worried about an exposure, the only way to confirm this will be to have tests to find out whether or not you have contracted the infection.

Knowledgeable Doctors

Because we only treat sexually transmitted infections our doctors and our whole team are dedicated and highly skilled in this area. They will not only help you with test results but also will give you guidance and any help and advice that you need regarding your sexual relationships.

Experience Quick and Confidential Private STI Testing in London

Discover our comprehensive range of STD screenings that have been designed to assess your well-being by testing for specific infections with a blood, urine or swab sample. Our skilled doctors perform a comprehensive range of testing to detect any sexually transmitted infections, whether you have symptoms or not. We deliver accurate results and offer any necessary treatment. Below are some of our most STI test options:

Choose a comprehensive sexual health screening packages

STI & STD testing for Women

Testing for women without symptoms

Women are given a swab to test for gonorrhea and chlamydia. You need to insert a small cotton bud into the entrance of your vagina and rotate the swab a few times against the walls of the vagina. We also perform a blood test for syphilis and occasionally hepatitis B or hepatitis C.

STI & STD testing for Women

Testing for women with symptoms

  • At STI Clinic, we perform complete genital examination with a speculum and require various swabs from the cervix and the vagina. Sometimes, we may examine your womb by conducting a vaginal examination.
  • We perform the necessary tests for non-STIs such as thrush, bacterial vaginosis (BV) and different STIs such as chlamydia, herpes, gonorrhea and trichomonas.
  • If you have had anal sex, we will examine your rectum and take swabs for sexually transmitted infections (STIs).
  • You may be asked for a urine sample.
  • We will take a blood sample for syphilis, HIV test, hepatitis B and C.
  • We may take a throat swab based on your condition.

STI & STD testing for Men

Testing for men with symptoms

  • We will conduct genital examination of the testicles, penis and genital skin that requires taking a swab from the tip of penis.
  • If you have received anal sex, we may examine your rectum and take swabs.
  • We will ask for a urine sample to test for gonorrhea and chlamydia.
  • We may take the blood sample for syphilis and HIV testing, hepatitis B and C in some cases.
  • We may ask you to take a throat swab depending on your situation.

Testing for men without symptoms

Men need to provide a urine sample that will be sent to the laboratory to test for gonorrhea and chlamydia. AT STI Clinic London, we also perform blood tests for HIV, hepatitis B or C and syphilis.

STI & STD testing for Men

Frequently Asked Questions and Answers

Sexually transmitted infections or STIs are typically spread when you have sexual contact with an infected person. These infections are usually passed from one person to the other at the time of anal, oral or vaginal sex and skin-to-skin contact. STIs may also occur due to an infection of certain types of bacteria that include - chlamydia, gonorrhea and syphilis or viruses such as - hepatitis B, herpes, human papilloma virus (HPV) and HIV.

Almost 20 million people in the United Kingdom get an STI each year. These infections mainly affect men and women of all backgrounds and economic levels. However, half of the new infections occur among young people who are in the age group of 15 to 24 years.

Women often have serious health problems from STIs when compared to men:

If chlamydia and gonorrhea are not treated on time, then this increases the chances of developing severe pelvic pain and ectopic pregnancy that can be life-threatening. Chlamydia and gonorrhea may even lead to infertility.

If pregnant women do not treat syphilis on time, then this can be the reason for death of infants.

Women have higher risk than men at the time of unprotected vaginal sex. protected anal sex puts women at greater risk for getting an STI than unprotected vaginal sex.

STI can lead to various health problems for women. Certain types of untreated STIs may cause:

  • Problems for getting pregnant or permanent infertility
  • Problems during pregnancy and health problems for unborn baby
  • Organ damage
  • Infection in other parts of the body
  • Certain kinds of cancer such as cervical cancer
  • Death

Some kinds of STIs make it easy for you to get HIV if you come in close contact with it.

You may get tested for STDs at different STD Clinic near you, community health centres or by attending your family doctor. In London some people prefer walk in clinic for STD check where experienced doctors in a non-judgmental environment will see them.

The right time to test for STIs is when:

  • You have a new sex partner(s).
  • You or your partners have other sexual partners
  • It is more than three to six months since your last test.
  • You notice some symptoms.
  • You have sex with someone who already has an STI.

Some signs and symptoms that indicate an STI are the following:

  • Bumps or sores on the genitals or in the rectal or oral area
  • Burning or painful urination
  • Discharge from the penis
  • Odd-smelling or unusual vaginal discharge or bleeding
  • Pain during sexual intercourse

Some STIs have symptoms such as itchy bumps, unusual discharge, and pain when you urinate, which can indicate that something is wrong. But, there are many sexually transmitted infections that do not have any symptoms. So, though you may not notice anything different, you could still have a transmissible infection.

To get an STI check, you can visit a local private sexual health clinic. The process usually involves providing a urine sample or self-taken swab for gonorrhea and chlamydia testing. HIV and syphilis testing requires a blood sample. Herpes testing is typically done when sores are present and a swab will be taken. By walk-in our private STI clinic in London, you can undergo the necessary tests.

The answer to this question is yes. Mostly, when you are on your period, this will not affect the test results or your overall experience. However, there are some examples when you would like to rethink about getting tested for STDs while being on your period.

Ask your doctor or nurse if you need to get tested for STIs. They can tell what tests you may need to perform and how they are done. The testing for STIs is also known as STI screening.

Getting tested and treated for sexually transmitted infections (STIs) must be confidential. Most infections can be treated. You may visit private GUM clinic in London to get STI testing and treatment services. Our walk in service allows you to fix an appointment instant, which ensures you do not have to wait for several days to see your doctor.

There is a very thin line difference between the two and that difference is completely technical. An STI (sexually transmitted infection) is an infection and when the infection develops into a disease in its matured stages, it is called an STD or sexually transmitted disease.

Getting tested for STIs can be easy and quick. Depending on what you are testing for, your health care provider may take a blood sample or a swab and ask you to provide a urine sample.

  • To test for chlamydia - Swab or urine sample
  • To test for gonorrhea - Swab or urine sample
  • To test for HIV - Blood test
  • To test for genital herpes with symptoms - Swab and blood test
  • Genital Herpes with symptoms - Swab and blood
  • To test for syphilis - Blood test or swab from chancre
  • To test for trichomoniasis - Physical examination, sample of discharge or swab of the infected area
  • To test for HPV or genital warts - Swab and visual diagnosis is possible as warts can be seen on both men and women

Your doctor may be able to tell if you have an STD. But there are some tests that take a few days for results to come from the lab – Blood tests for HIV, Syphilis and Hepatitis all return within 24 hours. At STI Clinic, Urine and Swab tests take a bit longer, as the sample is grown in the lab for bacteria – this can take up to 4 days.

Getting a screening test means detecting an infection that might not have any symptoms. Just like you go for a mammogram or screening for colon cancer, it is important to screen for sexually transmitted infections depending on the risk factor. There are no recommended tests or timings for everyone. These testing usually depend on your lifestyle and risk level.

Some STIs can be treated and fully resolved such as Chlamydia, Gonorrhoea, Syphilis and Ureaplasma while other STIs and blood-borne viruses such as HIV, HPV and Herpes cannot be cured but treated effectively. There are vaccines available for HPV and Hepatitis.

There is no difference, STD stands for Sexually Transmitted Disease and STI stands for Sexually Transmitted Infection.

Some GP practices or local sexual health (GUM) clinic, contraception clinics, pharmacies, and young people's services may provide testing for some sexually transmitted infections. But not everyone who has an STI will show any symptoms. You need to get checked by visiting STI Clinic London if your sex partner has symptoms even if you do not.

When exposed to sexually transmitted pathogens, women are more likely to get infected than men due to certain biological factors. Also, women have more exposed areas such as the cervix and the vagina, and small tears may occur in the vaginal tissue at the time of intercourse creating an easy pathway for infection.

There's Only One Way to Know

Getting tested is not only quick and easy, it's the only way to know for sure if you do or do not have an STD

Put Your Mind at Ease Today OR Call 020 7183 0649

Recent Google Reviews

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rating star iconI found out that my boyfriend was infected with an STI and so I needed to be checked. I was terrified. I was recommended to go to the STI Clinic London for the tests. I went and had the test and then treatment at this clinic. It was not the horrible experience that I thought it would be. The staff were very understanding and kind to me. Thank you!

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Katherine Bowen

Katherine Bowen

2 years ago

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rating star iconAs somebody who needed regular STI checks, and has had treatment for syphilis, I can recommend this clinic. The treatment is state of the art and the clinic is a nice place to visit. It is fresh and clean and the staffs are great.

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Elise Fitzgerald

Elise Fitzgerald

2 years ago

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rating star iconI was so I had been looking for a clinic that was affordable for regular STI checks in London. I found this clinic and I am very glad I did. I feel that the checks they do are very thorough and they always give me confidence that I am looking after my sexual health.

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Simon Dowe

Jerry Thomas

2 years ago

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rating star iconI was afraid that someone I had been with had Chlamydia so I went for testing. I was so comforted by the staff in the clinic and thankfully my test came back negative. Great clinic, brilliant staff.

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Lisa Morgan

Lisa Morgan

2 years ago

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rating star iconNobody really wants to have to go to an STI Clinic but if you do find that you have to, this clinic is the best one to go to! I have been visiting for a while for help with managing a recurring thrush condition. The staff are always helpful and kind.

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Anthony Clayton

Anthony Clayton

2 years ago

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rating star iconI had been having problems for some time, and did not want to go to my GP about it, as I was embarrassed. I found this clinic through an advert I saw and I thought that being in Harley Street, it was going to be a reputable place. I was right. I was looked after and did not feel the least bit embarrassed. Great place and great staff. I would recommend.

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Paul Adams

Charley Doreen

2 years ago

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