I tested at 5 days and it was negative. Am I clear?

No. You tested inside the window. Repeat at 1–2 weeks for chlamydia and gonorrhea, and follow the HIV and syphilis timelines above.

Should I test immediately and again later?

If you are symptomatic or need a baseline, yes — an early test plus a repeat at the right interval. A single early test alone is the trap.

Does the window change if I take antibiotics?

Antibiotics taken before testing can suppress the organism and produce a false negative — one of several reasons not to self-medicate.

When do I retest after treatment?

Generally at 3 months, per CDC — reinfection from an untreated partner is common. See retesting after treatment.

How Long After Exposure Should You Actually Get Tested?

Medically reviewed by our MD Laboratory Director (a role required by CLIA; the director's name is on file in the CMS CLIA database, #45D2048957, and can be verified independently) · Editorial policy

Molecular fluorescence imaging — Auspicious Laboratory, Houston

Too early is worse than not testing at all — because a false negative ends the search.CLIA #45D2048957 · CAP #8722734 · Same-day results · Walk-ins welcome

Every test has a window period: the interval between infection and the point where the test can reliably see it. Test inside the window and a negative result means "not yet detectable," not "not infected." Chlamydia and gonorrhea are typically detectable at 1–2 weeks; syphilis at 3–6 weeks; HIV, with a 4th-generation antigen/antibody test, at 18–45 days.

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The timeline, pathogen by pathogen

Pathogen	Earliest reliable test	Confirm again at
Chlamydia / gonorrhea (PCR)	1–2 weeks	—
Trichomonas (PCR)	1–4 weeks	—
Mycoplasma genitalium (PCR)	1–2 weeks	—
Syphilis (serology)	3–6 weeks	3 months if exposure was high-risk
HIV (4th-gen Ag/Ab)	18–45 days	3 months for a definitive answer
HSV (lesion PCR)	While the sore is present	Antibody testing has real limits — see below

A negative HIV test taken one week after exposure has told you nothing. The window has not opened yet.

If you were exposed in the last 72 hours, the priority is not testing

HIV post-exposure prophylaxis (PEP) must be started within 72 hours, and the sooner the better. Do not wait for a test result to decide. Read what to do after a possible HIV exposure and seek care today.

Symptoms change the calculus

If you have symptoms now — discharge, burning, a sore, pelvic pain — do not wait out a window period. Symptomatic infection can be tested and treated today. Waiting is for asymptomatic people trying to time a screening test correctly.

Same day, start to finish. Sample by 1:00 PM → results at 4:30 PM → if treatment is clinically appropriate, a licensed physician in our partner network sees you between 4:30 and 6:00 PM, a few minutes away. That window is reserved for patients tested here, and your slot is held the moment we take your sample — the slot is held, not hunted. On your own, a same-day appointment is nearly impossible; at an urgent care, you wait in the queue. STAT: ~2 hours, sample in by 3:00 PM.

FAQ

I tested at 5 days and it was negative. Am I clear?: No. You tested inside the window. Repeat at 1–2 weeks for chlamydia and gonorrhea, and follow the HIV and syphilis timelines above.
Should I test immediately and again later?: If you are symptomatic or need a baseline, yes — an early test plus a repeat at the right interval. A single early test alone is the trap.
Does the window change if I take antibiotics?: Antibiotics taken before testing can suppress the organism and produce a false negative — one of several reasons not to self-medicate.
When do I retest after treatment?: Generally at 3 months, per CDC — reinfection from an untreated partner is common. See retesting after treatment.