How often is often enough
There is no number that is right for everyone. There is a number that is right for how you actually live, and it is usually more frequent than people assume.
Public health guidance sets a floor, not a target. Annual screening for anyone sexually active, three-monthly for men who have sex with men with multiple or anonymous partners. Most people reading this are in the second group and testing at the rate of the first.
What actually drives the number
Partner count is the obvious input and not the only one. Two things move the answer more than people expect.
How connected your partners are to each other. Ten partners from the same scene, sauna or app radius is a denser network than ten partners across a year of travel, and infections move faster through dense networks. The relevant question is not how many people, but how many people they are also seeing.
Whether anything you do would show symptoms. Since rectal and throat infections are usually silent, receptive anal and oral sex tilt you toward more frequent testing regardless of numbers — there is no symptom to prompt you, so the calendar has to do it.
It means you almost never have to reason about window periods. A full panel every three months covers whatever happened in the previous quarter, because everything with a twelve-week window has closed by the time you sit down again. Routine testing removes the maths that exposure-driven testing forces on you.
When to break the pattern
A routine cadence handles the general case. Test off-schedule when:
- A partner tells you they tested positive — go, regardless of when you last went
- Symptoms appear, at any site: discharge, pain on urinating, a sore, a rash, sore throat that lingers oddly
- A specific encounter is sitting badly with you — an intuition worth acting on rather than arguing with
- Before starting with a new regular partner, so that both of you have a real baseline rather than an assumption
None of these replace the routine schedule. Test now, and keep the next scheduled one.
Making it actually happen
The reason people test less than they intend is almost never denial. It is that three months is exactly long enough to lose track of, and the prompt to go never arrives. Whatever system you use — a recurring calendar entry, a standing appointment, an app — the job it needs to do is remember on a timescale your brain does not.
If you are on PrEP, this is largely solved for you: the monitoring appointments are already three-monthly and already include a full panel. Attendance at those is the single highest-value habit in this whole area.
Questions people actually ask
I have had no sex since my last test. Do I still need to go?
No. The clock runs on exposure, not on the calendar. If nothing has happened, nothing has changed — which is also why an app that tracks what you actually did gives a better answer than a fixed reminder.
Is testing too often a problem?
Not medically. Monthly is fine if it is what you want. The two real costs are your time and, in some systems, money — and there is a point where anxiety is driving the schedule rather than risk, which is worth noticing without judging yourself for it.
Everyone I sleep with is on PrEP. Does that change anything?
For HIV, meaningfully. For everything else, not at all — and bacterial STI rates are higher in PrEP-using networks. If anything, it is an argument for the three-monthly cadence rather than against it.
I am in a monogamous relationship. Do we need to keep testing?
One baseline test each, once you are both confident about what you are agreeing to, and then it becomes a question about the agreement rather than about medicine. Plenty of people keep an annual test anyway, which costs nothing and quietly removes a whole category of doubt.
This page is general information, not medical advice. National guidance differs and changes over time. Anything specific to your situation is a conversation for a clinician or sexual health service. Candor is a personal record-keeping app; it does not diagnose, treat or prescribe.
Get Candor
A cadence you do not have to remember
Candor works out when you are next due from what you have actually logged, not from a fixed calendar.
14 days free, then US$19.99 / year · iOS 26 or later · Ages 18+