My partner tested positive for chlamydia but I tested negative. What now?

Short answer

Different results do not tell you who had chlamydia first, whether anyone was unfaithful, or whether a test is wrong. Timing, the body site tested, and whether infection was present at the time of sampling can all matter. Tell the clinician about your partner’s result and the dates and types of contact, then follow their advice about testing, treatment, and follow-up.

Tests are snapshots, not relationship timelines

Chlamydia can be symptom-free and can be present at different sites. A negative test may be accurate for the sample and time taken, while still leaving questions if a relevant site was not tested or exposure was very recent. A positive test also cannot date an infection.

Ask which body sites were sampled, when the tests were taken, and whether either of you had sex after testing. Bring those details to a clinic rather than trying to compare symptoms or search histories for proof.

Follow clinical advice, even if you feel well

The clinic may advise a repeat test, treatment because of partner exposure, or both. Do not use an old test result as a reason to skip care. They can also help with confidential partner notification.

Keep the conversation kind and practical

Results can bring up fear and mistrust. Staying with facts, care, and prevention is usually more useful than assuming the result explains the history of a relationship.

Sources and further reading

CDC: Chlamydial infections treatment guidelines (accessed August 2026)
CDC: Getting tested for STIs (reviewed March 17, 2026)