2 doctors weighed in:

What causes a chlamydia test to be a false negative?

2 doctors weighed in
Dr. Hunter Handsfield
Internal Medicine - Infectious Disease
1 doctor agrees

In brief: It's just random

Tests miss 5-10% of infections, more by urine, less by urethral or vaginal swab.
Maybe other possibilities as well. Chlamydia clears on its own in a few weeks to months, so current testing is negative. Or s/he received an antibiotic for chlamydia (and didn't admit it) or for another infection, curing chlamydia or interfering with the test. Partner(s) of infected person need Rx, even w/ neg tests.

In brief: It's just random

Tests miss 5-10% of infections, more by urine, less by urethral or vaginal swab.
Maybe other possibilities as well. Chlamydia clears on its own in a few weeks to months, so current testing is negative. Or s/he received an antibiotic for chlamydia (and didn't admit it) or for another infection, curing chlamydia or interfering with the test. Partner(s) of infected person need Rx, even w/ neg tests.
Dr. Hunter Handsfield
Dr. Hunter Handsfield
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