Last updated: August 15, 2026
A steady stream of patients come to me for advice after a high-risk sexual encounter. Most are men, largely because men tend to develop symptoms while women often have none at all — or only something vague like an unusual odour or mild itching. That difference matters more than it sounds: it means a woman can carry and pass on an infection without ever suspecting it.
Chlamydia and gonorrhoea are the two commonest sexually transmitted infections in the world, with over 200 million new cases a year. They are transmitted through vaginal, oral and rectal contact. In men, urethral discharge and pain on passing urine typically appear 3–14 days after exposure.
Why the test changed
Testing used to mean a urethral swab — a cotton tip inserted about 4 cm into the urethra, uncomfortable enough that it discouraged plenty of men from being tested at all, and only around 50% accurate depending on who took it.
Today the standard is NAAT (nucleic acid amplification testing) using PCR, which finds the organism’s genetic material in a simple morning urine sample and reaches up to 98% accuracy. No instrument goes anywhere near the urethra. If the swab is what has been putting you off, that obstacle no longer exists.
The 7 infections detected in one urine sample
- Chlamydia trachomatis
- Neisseria gonorrhoeae
- Trichomonas vaginalis
- Mycoplasma genitalium
- Mycoplasma hominis
- Ureaplasma urealyticum
- Ureaplasma parvum
What this test does not cover
This is the part that matters most, and it is the reason a urine PCR panel is not the same thing as “a full STD check”. The panel above does not detect HIV, syphilis, genital herpes or HPV. Those need separate testing — blood tests for syphilis and HIV, and clinical assessment for herpes and warts.
A clear urine PCR result after a high-risk encounter is genuinely reassuring about seven infections. It is not a clean bill of health, and treating it as one is the mistake I most want to prevent. Decide what to test for with a doctor, based on what actually happened.
When to take the test
Timing changes the result. Testing too soon after exposure can give a negative even when infection is present, because there is not yet enough genetic material to detect — the window period. For chlamydia and gonorrhoea, testing is generally reliable from about 1–2 weeks after exposure; the blood-borne infections above have their own, longer windows.
Two practical points: hold your urine for at least an hour before giving the sample, since freshly flushed urine dilutes what the test is looking for; and if you have symptoms now, do not wait for a window period to pass before being seen.
The good news, stated accurately
All seven infections on this panel are bacterial or parasitic, and all of them are curable with the right antibiotic. That is a genuinely encouraging thing to be able to say. It applies to this panel — HIV, herpes and HPV are managed rather than cured, which is another reason to know which test you have had.
Two things make the difference between treatment working and the same infection returning a month later: finishing the full course, and your partner being treated at the same time. Reinfection from an untreated partner is the commonest reason a cured infection reappears.
If you have had a high-risk sexual encounter or want a confidential, painless STD screening via multiplex PCR urine test, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Book a Consultation. Appointments at Samitivej Sriracha Hospital can be arranged by calling the Urology department on 088-022-1445.
Frequently Asked Questions about STD PCR Urine Testing
The STD PCR urine test (Multiplex NAATs – Nucleic Acid Amplification Test) is a highly accurate method for detecting sexually transmitted infections using a simple urine sample. It uses PCR technology to amplify and identify the genetic material of STD pathogens. A single morning urine sample can screen for up to 7 common STDs simultaneously with up to 98% accuracy, requiring no painful urethral swab.
Traditional urethral swab testing is painful, invasive (requiring insertion 4 cm into the urethra), and has only about 50% accuracy, which is also operator-dependent. PCR urine testing is completely non-invasive, requires only a small morning urine sample, and achieves up to 98% accuracy. It is more reliable, more comfortable for patients, and can screen for multiple STD pathogens in a single test.
A single multiplex PCR urine test can simultaneously detect Chlamydia trachomatis, Neisseria gonorrhea, Trichomonas vaginalis, Mycoplasma genitalium, Mycoplasma hominis, Ureaplasma urealyticum, and Ureaplasma parvum. It does NOT detect HIV, syphilis, genital herpes or HPV, which require separate blood tests or clinical assessment. A clear PCR result is not a complete STD screen on its own.
Yes. Many women with Chlamydia and Gonorrhea infections are completely asymptomatic or experience only mild, non-specific symptoms such as unusual vaginal odor or mild itching. This is why STDs are often underdiagnosed in women until complications develop, including pelvic inflammatory disease or fertility problems. PCR urine testing is an excellent screening option for women after potential STD exposure, even without symptoms.
The bacterial and parasitic infections on this panel – Chlamydia, Gonorrhea, Trichomonas, Mycoplasma and Ureaplasma – are all curable with appropriate antibiotic treatment. Viral infections such as HIV, genital herpes and HPV are managed rather than cured. Early diagnosis, completing the full course of treatment, and treating your partner at the same time are essential to achieving cure and preventing reinfection. Untreated infections can lead to infertility, epididymitis and pelvic inflammatory disease.
Disclaimer: This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. No medical advice, diagnosis or prescription is provided through personal messaging channels. Always consult a qualified healthcare professional before starting any medical treatment.
Medically written & reviewed by: Dr. Soarawee Weerasopone (Dr. Pom) — Board-Certified Urologist, Bangkok Hospital Headquarters, in urological practice since 2016. Fellowship: Robotic Surgery, Chang Gung Memorial Hospital, Taiwan (2019) · Observership: Endourology, Juntendo University Hospital, Tokyo (2022) · Research Scholar & Clinical Observer, Scott Department of Urology, Baylor College of Medicine, USA (2025–2026).
Dr. Soarawee Weerasopone (Dr. Pom) is a board-certified urologist at Bangkok Hospital Headquarters, specializing in Men’s Health, Robotic Surgery (da Vinci Xi) and Kidney Stone treatment. He is currently a Research Scholar and Clinical Observer at the Scott Department of Urology, Baylor College of Medicine (2025–2026), under Prof. Mohit Khera. He completed a Robotic Surgery Fellowship at Chang Gung Memorial Hospital, Taiwan (2019) and an Endourology Observership at Juntendo University Hospital, Tokyo (2022).
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