When you can come in
The clinic opens seven days a week for STI testing, not only on weekdays. Weekday hours run longer; the weekend hours are shorter but still cover a full visit, from consultation to sample collection, with the same range of tests on offer as during the week.
Nothing about the visit itself changes at the weekend. The same doctor-led consultation, the same sample types and the same lab processing apply on a Sunday afternoon as on a Tuesday morning. The only difference is the window you have to come in.
Booking late at night
You don't need to wait for office hours to book. Online booking stays open around the clock, so a booking made late at night still secures a slot the next morning rather than leaving you to call back later. At our clinic, 23% of sexual-health appointments were booked outside office hours, between 18:00 and 08:59.
A further 7% were booked between 23:00 and 06:59, in the middle of the night. At our clinic, 23% of sexual-health visits were at the weekend, 64% were booked for the same day, and 85% for the same or next day. Most of our patients, in other words, book close to the day they want to be seen. Booking online guarantees your slot for a chosen time; walking in during opening hours works too, when there's capacity.
Which test to book at the weekend
Weekend hours don't limit which test is available. The full range can be booked on a Saturday or Sunday: a FAST Screen for a same-day answer, a Bronze Screen for a lower-cost standard panel, or a single infection test if you already know what you want checked. Prices are the same on every day of the week.
If you want to understand what a same-day visit actually involves, from arrival to result, our guide to what happens at a same-day test covers the FAST process step by step. A single HIV test starts from £75, and a single chlamydia test is £104. For broader coverage at a lower price than FAST, the Bronze Screen sits inside our STI screening packages, alongside Silver and Gold tiers that add more infections to the same visit.
Timing your test after sex
When to test matters as much as which day you come in. Testing too soon after a possible exposure can give a false negative, because the infection hasn't reached detectable levels yet. Our guide to when to test after sex sets out the window for chlamydia and other common infections.
A weekend slot is still worth booking even if you're inside the window: a doctor can advise on timing at the consultation, and you can come back for a repeat test once enough time has passed, at the weekend or during the week.
If the risk was in the last 72 hours
The clinic doesn't provide PEP (post-exposure prophylaxis, the short course that can prevent HIV after a high-risk exposure), so if your exposure happened within the last 72 hours, the right next step is to contact an NHS sexual health clinic or A&E, since PEP needs to start as soon as possible.
What to bring and how the visit runs
Every visit starts the same way, whether you walk in or arrive for a booked slot: a short consultation with a doctor, then sample collection either as a urine sample, a swab or a blood draw depending on the test. You don't need to bring anything, and you don't have to use your real name.
If you're walking in rather than booking, be ready for a short wait if the clinic is busy. If privacy is part of why you're choosing a weekend or out-of-hours visit, our overview of private STI testing in London explains how a confidential appointment works, from registration to results.
Whether you need a Saturday appointment, a Sunday slot or you're booking at midnight for the next available morning, testing at 117a Harley Street doesn't wait for a weekday. Book same-day STI testing online now, or walk in during opening hours.
