The first reason to test for sexually transmitted infection is when the person considers there has been a risk of transmission or if they are embarking upon a new relationship and both partners wish to be responsible and ensure they do not bring infection to the new partner.
Women test with a vaginal swab which may be self-taken and men produce a urine sample.
It is useful to swab other areas too if they have been exposed eg mouth, rectum
There is also a blood test to check for what is described as bloodborne infections-syphilis, HIV, hepatitis
These tests can be obtained online depending on the local provider or a person can attend a sexual health clinic. The availability varies according to where a person lives with some clinics having open access walk-in clinics and others requiring a person to book online first
Tests may be offered by a GP or other practitioners such as gynaecologist, contraception provider or any doctor managing genital conditions.