HIV testing & U=U

Why test, and how often

Most people with HIV today are diagnosed through routine testing, not because they feel unwell — many infections have no symptoms for years. Testing regularly means that, if you ever do test positive, you can start treatment early, stay healthy, and protect partners. A good rule of thumb for sexually active gay and bisexual men is to test for HIV and STIs every 3 to 6 months, or more often if you have new or multiple partners. If you're on PrEP, HIV testing is already built into your regular check-ups.

Ways to test in Ireland

There's no single "right" way to test — pick whatever you'll actually do. All of these are free and confidential:

• Free home STI test (including HIV) — order online from the HSE and a kit is posted discreetly to your home. You take a small blood sample and swabs yourself, send them back, and get your results by text. It's the easiest option for many people.
• Public STI/GUM clinics — free, confidential testing with a clinician, plus treatment and advice on the spot. Gay and bisexual men can also use dedicated services such as the Gay Men's Health Service in Dublin.
• Community rapid testing — HIV Ireland's MPOWER programme and partner organisations offer free, fast, finger-prick HIV testing in community and LGBTQ+ settings, with results in minutes.

The "window period"

After a possible exposure, HIV takes time to show up on a test — this is the window period. Modern lab (blood-draw) tests are very accurate from around 4 weeks, while rapid finger-prick and home tests may need a little longer to be conclusive. If you test soon after a risk, the clinic may suggest testing again to be sure. If the exposure was in the last 72 hours, ask about PEP straight away — see our PrEP & PEP guide.

If you test positive

A positive result is not the news it once was. With today's treatment, people living with HIV live long, healthy lives and, once their treatment is working, cannot pass HIV on to partners (see U=U below). You'll be linked to specialist care, and treatment in Ireland is free. You don't have to face it alone — HIV Ireland offers free, confidential support, counselling and peer connection for people who are newly diagnosed and those supporting them.

U=U — Undetectable = Untransmittable

U=U stands for Undetectable = Untransmittable. It means that a person living with HIV who is on effective treatment and has an undetectable viral load — so little virus in their blood that standard tests can't measure it — cannot pass HIV on to sexual partners. Not "low risk" — zero risk through sex.

This is backed by a global scientific consensus and some of the largest studies ever done. The PARTNER and PARTNER 2 studies followed thousands of couples — gay and straight — where one partner had HIV with an undetectable viral load and the other did not, across many years and tens of thousands of acts of sex without condoms. The number of HIV transmissions from an undetectable partner was zero. Health bodies and HIV organisations worldwide, including NAM aidsmap and the Prevention Access Campaign that coined the phrase, endorse U=U.

U=U is more than a fact — it's a reason to test, treat and talk openly, free of stigma. It transforms what an HIV diagnosis means, and it's why getting tested and starting treatment matters so much.

See also PrEP & PEP explained, STIs, mpox & vaccinations, and where to find a sexual-health clinic.