STD testing in Taichung: what a full STI panel covers and when to test

In short

• No symptoms does not mean no infection. Gonorrhoea, chlamydia, HIV and syphilis are all found in people who feel normal.
• A urine sample alone is the most common gap. Oral sex means the throat, anal sex the rectum: the specimen site follows the sexual act.
• Timing decides what a result means. Each infection has its own window period, so a test done too early answers nothing.
• The anonymous routes here cover HIV and syphilis. The discharge-type infections are not in any of them.
• A formal written report for work, a visa or insurance cannot come from anonymous screening.

No symptoms does not mean no infection

“I have no discharge and no pain. Do I really need a test?” You may still need one. Many sexually transmitted infections cause no clear symptoms early on, and some cause none at all.

So the decision is not based on how you feel, but on your exposure. The doctor will ask about the date of your last sexual contact, condom use, whether it was vaginal, oral or anal sex, new or additional partners, whether you take PrEP (pre-exposure prophylaxis, medication taken before sex to lower the risk of HIV), and any sexually transmitted infection you have had before.

Taiwan CDC advises at least one HIV test for everyone who is sexually active, and more often after unprotected sex; how often is set out further down.

The most common mistake: testing urine only

An infection develops where the contact happened. Oral sex means the throat, anal sex the rectum, and vaginal or penile contact the genital and urinary tract. If only urine is tested, the other sites are not examined.

For gonorrhoea and chlamydia in men who have sex with men, the US CDC guidelines say the urethra, the rectum and the throat should be tested according to the sites of actual contact.

This is why, at a first visit here, we ask four direct questions: was there oral sex, receptive anal sex, insertive anal sex, or vaginal sex? The answers decide where the specimens are taken from, not a judgement on your private life.

Tests commonly used at this clinic

HPV DNA testing is not part of a general panel; it is arranged separately when it is useful. Anti-HBs, anti-HAV IgG and HIV RNA RT-PCR (a test that looks for the genetic material of the virus itself) can also be added.

Two of these tests need careful reading, because a positive result does not automatically mean treatment. A positive HSV-1/2 IgG only shows past contact with the virus, not where it is, whether it will flare up, or when you are infectious; the US CDC does not recommend routine antibody screening in adults with no symptoms. For Mycoplasma genitalium the US CDC also advises against routine screening without symptoms: resistance to antibiotics is rising, and treating people with no symptoms makes later treatment harder. Both help most when there are symptoms — blisters that keep coming back but are never swabbed in time, or urethritis that does not settle after treatment. So the largest panel is not automatically the right one.

Anonymous screening here, and what it cannot do

This clinic is listed on two Taiwan CDC registers (medical institution code 3503241524), and runs a monthly anonymous screening session with the Taiwan Base Association in Taichung. Three routes are available:

• Taiwan CDC anonymous screening at this clinic — a rapid blood test for HIV. This one is available at every consulting session.
• Syphilis anonymous screening for young people and students aged 24 or under — a rapid syphilis test. This is a separate service with its own age limit, and it depends on the test kits allocated by Taiwan CDC, so please ask on LINE first.
• The joint session with the Taichung Base — HIV and syphilis, one session a month, 18:00–21:00, with registration closing at 20:30.

For this service we do not check your National Health Insurance card or any identity document, so it is open to you regardless of nationality. There is no charge for it. No formal report can be issued, because no identifying information is recorded. Results are given to you under a code number. So a negative result from this anonymous route leaves nothing that can be linked to you. If the rapid test comes back positive, the follow-up test and any treatment are arranged under your own name, because that is how medication and partner care are organised. Once a result meets the official case definition, the clinic has to report it to the health authority by law. That report is for disease control and to arrange treatment. It is not a report to the police.

Taken together, these routes cover HIV and syphilis, and nothing else. The discharge-type infections — gonorrhoea, chlamydia, Mycoplasma genitalium and trichomoniasis — are in none of them, and in people with a new partner or several partners they are usually more common than HIV.

A rapid test also cannot sample the throat or the rectum, because it uses blood only; it cannot do HIV RNA RT-PCR after a very recent exposure; and it cannot produce a formal written report for work, a visa or insurance. So deal with HIV and syphilis through the free routes first, then add what your actual sexual practice calls for — both on the same day.

How soon after exposure is a test meaningful?

The window period is the gap between becoming infected and the point at which a test can detect it. If you test too early, a negative result means little. These are the usual reference ranges; the laboratory method used and the doctor’s interpretation decide the final answer.

If you are still inside those intervals, it usually does not mean “do not test”. It means: assess whether post-exposure prophylaxis (PEP, medication started after a possible exposure to prevent HIV) is needed, record a baseline result, then book the repeat test. For an earlier answer on HIV, the doctor may arrange HIV RNA RT-PCR. But no test can rule infection out completely, and PrEP, PEP or other anti-HIV medication can affect nucleic acid testing, so PCR does not replace the antigen/antibody tests done later on schedule.

Hepatitis: infection is one question, protection is another

Many panels include only HBsAg, the marker of current hepatitis B infection or carrier status. For someone with ongoing exposure risk, anti-HBs matters just as much, because it shows whether protection is present. Anti-HBc can be added to judge a past natural infection. If you completed the vaccine course years ago and anti-HBs is now negative, protection is not necessarily gone: Taiwan CDC states that antibody levels can fall over time while immune memory may remain, and that a booster should be assessed by a doctor.

Hepatitis A spreads mainly by the faecal-oral route, but oral-anal contact and anal sex can also transmit it, and Taiwan CDC lists men who have sex with men as a high-risk group. Anti-HAV IgG can be added, and Taiwan CDC advises that high-risk people without the antibody may complete two self-paid doses of hepatitis A vaccine for long-term protection — worth reviewing with other travel vaccination before you go abroad.

How often should I be tested?

This follows Taiwan CDC advice on HIV screening, and US CDC advice on frequency and sampling sites in men who have sex with men. A negative result describes one moment only, and changing behaviour is the main part of prevention.

Your visit: how many trips, and how reports work

The consultation follows a fixed order: the date of exposure, the type of sex, the specimen sites, then the tests. Anything that cannot wait comes first. Positive results are interpreted by the doctor, who arranges treatment and partner management. Prevention is discussed at the same visit: PrEP, doxycycline post-exposure prophylaxis (an antibiotic taken after sex to lower the risk of some bacterial infections), the 9-valent HPV vaccine, and hepatitis A and B vaccination.

Please bring your passport or resident certificate; it is needed to create the medical record. If you are not enrolled in Taiwan’s National Health Insurance, the consultation and tests are self-paid. Costs are explained at the consultation. HIV, syphilis and gonorrhoea are notifiable diseases in Taiwan. When a test result meets the official case definition, the clinic must report it to the health authority by law, and the report includes your name and your passport or resident certificate number. Paying out of pocket does not remove this duty. The report goes to the health authority for disease control and to arrange treatment and medication. It is not a report to the police, and your personal information is protected by the Communicable Disease Control Act, Article 10. A negative result is not reported.

One visit is the usual plan for coming in and giving the samples. Reports normally take one to three working days, depending on the test and the laboratory; items needing a second confirmation stage take longer. You can read your report through the clinic’s LINE official account, so a second trip is not needed. If a report is abnormal, the clinic contacts you and arranges a return visit so the doctor can explain it in person. Please make sure the mobile number you give can receive calls, and check your report yourself in any case. This clinic does not provide online consultations or prescriptions.

Two situations are different. If your last high-risk contact was within 72 hours, you need an assessment for post-exposure prophylaxis first, not screening; please say so at registration. If you already have symptoms — discharge, pain on passing urine, an ulcer or a rash — giving a sample and waiting is not the right route either: under the current national adult syphilis and gonorrhoea treatment guidelines, a person whose presentation fits urethritis is usually started on treatment at that same visit, with the results used later to confirm or adjust it.

Before you come: note whether you have symptoms, which sites were exposed, the date of your last possible exposure, and any antibiotics taken in the past two weeks. If a urine sample may be needed, try not to pass urine for one to two hours beforehand.

Points that often need clearing up

Related pages

• After a possible exposure: when to test for what (Chinese)
• Anonymous HIV and syphilis screening in Taichung (Chinese)
• Discharge or pain on passing urine (Chinese)
• Gonorrhoea: diagnosis and treatment (Chinese)
• HIV RNA RT-PCR after a recent exposure (Chinese)

Appointments and access

Consultations are conducted in Mandarin, and can also be conducted in English.

昭安泌尿科診所 (Morning Urology Clinic)
No. 98, Boguan 2nd St., West District, Taichung City 403, Taiwan（403 臺中市西區博館二街98號）
Consulting hours: Monday to Saturday (closed Sunday). Online booking is open 24 hours.

This page was produced by 昭安泌尿科診所 (Morning Urology Clinic). Medical content last updated: June 2026 (same as the Traditional Chinese version). English version published: 4 September 2026. Medically reviewed by Dr. Chao-An Chen, urologist.

Sources: US CDC, Sexually Transmitted Infections Treatment Guidelines, 2021 / Taiwan CDC, pre-exposure prophylaxis (PrEP) / Taiwan Centers for Disease Control, for HIV screening, PEP, hepatitis vaccination advice and the anonymous screening register.

This page provides general medical information and does not replace an individual diagnosis or treatment plan. Please confirm anything concerning your own symptoms or test results at a face-to-face consultation.