When and how to get tested
Knowing when to test — and which tests to get — is just as important as deciding to get tested. Testing too early can produce a false negative. This guide covers everything you need to know.
Testing windows by infection
Testing before these windows have passed may produce a false negative result. Waiting is not easy, but it produces reliable results.
| Infection | Earliest test | Definitive result |
|---|---|---|
| HIV (4th gen test) | 45 days | 90 days |
| Chlamydia | 2 weeks | 2 weeks |
| Gonorrhoea | 2 weeks | 2 weeks |
| Syphilis | 6 weeks | 12 weeks |
| Herpes (blood test) | 12 weeks | 16 weeks |
| Herpes (swab, during outbreak) | Any time | When symptoms present |
| HPV | N/A — no routine test | Cervical screening only |
| Hepatitis B | 6 weeks | 3 months |
| Hepatitis C | 8–11 weeks | 6 months |
Windows are approximate. Individual circumstances may vary. Consult a healthcare provider if unsure.
Types of STI test
Different infections require different testing methods. A comprehensive screen will use a combination.
Urine samples
Used to test for chlamydia and gonorrhoea in the urethra. Easy to collect at home or in clinic. You should not urinate for at least 1 hour before collecting the sample.
Genital swabs
Self-taken or clinician-taken swabs from the vagina, cervix, urethra, rectum, or throat. Used for chlamydia, gonorrhoea, and herpes. Essential if you have had anal or oral sex.
Blood tests
Used for HIV, syphilis, herpes (IgG), hepatitis B and C. A finger-prick blood sample is sufficient for most home tests. Venous blood is used in clinic for more detailed testing.
Throat swabs
Recommended if you have had oral sex. Pharyngeal gonorrhoea is common in people who have oral sex and rarely causes symptoms. A throat swab is the only reliable way to detect it.
Where to get tested
Four common paths in the US: specialist STI clinics, your primary care provider (PCP), home-use rapid kits, and home lab collection kits. Compare them below, then open any option for a full guide.
Sexual health / STI clinics
The gold standard. Confidential and comprehensive. Staffed by specialists. No referral needed in most cases. Same-day or walk-in appointments often available.
Full details on STI clinicsPrimary care provider (PCP)
Your primary care provider (PCP) can order an STI screen or refer you to a specialist clinic. A good option if you already have an established relationship with a doctor, particularly in rural areas.
Full details on primary care testingHome-use rapid test kits
Over-the-counter or self-administered tests that give results at home, often in minutes. Convenient for screening, but scope and accuracy vary by infection and product.
Full details on rapid kitsHome-use lab collection kits
Collect urine, swabs, or blood spots at home and mail them to a laboratory. Broader panels than most rapid kits, with results typically in a few days.
Full details on lab collection kitsCompare testing options
A quick side-by-side view. Select a column heading to read the full guide for that option — including cost, privacy, accuracy, timing, convenience, suitability, and limitations.
| Factor | STI clinicsDetails | Primary careDetails | Rapid kitsDetails | Lab kitsDetails |
|---|---|---|---|---|
| Cost | Often free / low-cost | Insurance-dependent | Out-of-pocket retail | Often higher cash price |
| Privacy | HIPAA; clinic record | In your medical record | Highest discretion | Portal-based results |
| Accuracy | Lab + multi-site care | Lab quality if ordered well | Varies; confirm positives | Lab NAAT if done right |
| Time to results | Minutes–days | Days after draw | Minutes | 2–5 days + shipping |
| Convenience | Travel / wait possible | Needs appointment | At home, no mail | At home + ship |
| When appropriate | Symptoms, PEP, full screen | Routine care continuity | Interim HIV screen | Asymptomatic screen |
| Limitations | Access / hours vary | May miss multi-site tests | Narrow scope; confirm + | No exam / treatment |
How often should I get tested?
The right frequency depends on your individual circumstances and sexual activity.
Sexually active and under 25
Annual chlamydia screen at minimum
New sexual partner
Full STI screen after each new partner
Multiple partners
Every 3–6 months (full panel)
Men who have sex with men (MSM)
Every 3 months (HIV, syphilis, gonorrhoea, chlamydia)
After unprotected sex with unknown partner
Full screen at appropriate windows
Before starting a new relationship
Full panel screen recommended
Not sure when to test?
Use our STI Testing Timeline to see when each infection becomes detectable after a potential exposure.
STI Testing Timeline