Which STD Screen?

Although correct use of condoms does reduce the risk of STIs, the risk is not completely eliminated as condom failure can occur and STIs can be transmitted by other sexual activities.

Infections such as herpes and HPV can still be transmitted by skin to skin genital contact even with condom usage. In addition, STIs often occur together. Therefore, it is always worth having full screens.

If you're unsure which STD screen you may need, you can find out more below.


  • Next day appointments
    Bookable online with live availability or walk-in appointments
  • Private health clinics
    Clinics regulated by the Care Quality Commission and experienced nurses
  • STD testing & STI screening
    Chlamydia, HIV and sexual health checks for asymptomatic conditions
  • Caring & Confidential
    Confidential consultation with our nurse and medical assessment

Oral Intercourse

The main risks associated with oral sex, both receiving and giving are:

  • Chlamydia
  • Gonorrhoea
  • Syphilis
  • Herpes

There is very low risk of acquiring HIV or Hepatitis B from oral sex, unless there are cuts to the mouth or genitalia or bleeding from the gums.
Receiving oral sex carries a higher risk of STIS.

Vaginal Intercourse

The main risks associated with vaginal sex are:

  • Chlamydia
  • Gonorrhoea
  • HIV
  • Hepatitis B
  • Hepatitis C
  • Syphilis
  • Herpes
  • HPV (wart virus)

In men, it can lead to Non Specific Urethritis, which is caused by wide variety of organisms such as Mycoplasma genitalum, Ureaplasma urealyticum and Trichomonas vaginalis.

In women, it can lead to Trichomonas vaginalis infection, which causes abnormal vaginal discharge. Although Bacterial vaginosis and thrush are not sexually transmitted infection, they can be precipitated in women by sexual intercourse.

Anal Intercourse

Anal intercourse, especially receiving anal sex, has the highest risk of acquiring STIs, particularly HIV.

The main risks are:

  • Chlamydia
  • Gonorrhoea
  • HIV
  • Hepatitis B
  • Hepatitis C
  • Syphilis
  • Herpes
  • HPV

Fingering/Fisting

If there are cuts or sores on the fingers or around the vagina or anus, then there is a small risk of acquiring Hepatitis B, HIV and Hepatitis C.

Herpes and HPV can also be caught by this activity as they are spread by skin to skin contact.

Sharing Sex Toys

Chlamydia and Gonorrhoea are found in vaginal secretions and semen and can therefore be transferred by sharing sex toys.

If there are cuts/sores around the penis, vagina or anus, then there is a small risk of acquiring Hepatitis B, Syphilis, HIV and Hepatitis C.

Your nearest CityDoc clinic

Find a clinic

Receiving STD results

During your appointment test results and timings will be discussed. All test results are sent to our London based Harley Street laboratory for analysis and results will be sent directly to you once complete. If your results are positive, our specialist team will be in contact and provide NHS referrals if required. We provide treatment nationwide for Chlamydia and in our London flagship clinics we offer treatment for both Chlamydia and Gonorrhoea.

Receiving results

Sexual health FAQ’s

Are you unsure on the difference between an STD and STI? What happens if I have a positive result? If you are looking for answers to these and other sexual health questions, we have put together a list of FAQ’s for you.

Sexual health FAQ’s

City of London (Moorgate) Flagship Clinic

16 City Road,
London,
EC1Y 2AA
Opening Hours:
Mon9:00 to 17:00
Tue9:00 to 17:00
Wed9:00 to 17:00
Thu7:00 to 15:30
Fri7:00 to 15:30
Screenshot 2023-11-10 172145

Hitchin Flagship Clinic

5 Portmill Lane,
Hitchin,
SG5 1DJ
Opening Hours:
Mon9:00 to 18:00
Tue9:00 to 17:00
Wed10:00 to 18:00
Thu10:00 to 19:00
Fri9:45 to 16:30
Sat9:00 to 14:00
Hitchin clinic

London Victoria Flagship Clinic

231 Vauxhall Bridge Road,
London,
SW1V 1AD
Opening Hours:
Mon8:30 to 20:00
Tue9:00 to 17:00
Wed8:30 to 20:00
Thu9:00 to 17:00
Fri9:00 to 17:00
Sat9:00 to 17:00
Victoria

Sexual health enquiries

If you need further help regarding any sexual health matters, simply contact us below

Travel Vaccinations

Flu (Influenza) Vaccination

Sexual Health

Find a Clinic