It is common to ask for “an STI test,” but the most useful testing plan depends on what you are trying to rule out. Syphilis, chlamydia and gonorrhoea are different infections, and the relevant test can depend on timing, symptoms and the sites of contact.

Syphilis is commonly assessed with blood tests

Syphilis testing often begins with a blood sample. A clinician may interpret screening and confirmatory results together, because a single reactive screening result is not always the final diagnosis. Let the clinic know about previous syphilis treatment or prior test results, as this may affect how results are understood.

Chlamydia and gonorrhoea may need urine or swab samples

For chlamydia and gonorrhoea, the sample type can matter. Depending on the exposure, a urine sample or swab from a relevant site may be considered. A test from only one site may not answer questions about another site of contact, which is why a straightforward, factual history helps.

Symptoms are only part of the picture

Some people have discharge, pain when urinating, sores, rash or throat symptoms. Others have no symptoms at all. Symptoms can have many causes, so they are a reason to seek assessment rather than a reliable way to identify an infection on your own.

Timing and treatment matter

A recent exposure can require a plan for testing now and possibly testing later. Avoid self-starting antibiotics before your appointment unless a clinician has advised them, because they can affect testing and treatment decisions.

Learn more about chlamydia testing and gonorrhoea testing in Phuket.

Further reading: Clinical information from CDC or WHO. This guide is general information and does not replace an individual medical assessment.