Fishy Smell But My BV Test Was Negative
Testing negative for BV but still noticing a fishy smell is more common than you think — and it has real explanations. Here's the complete breakdown.
Last updated: 2026-06-08
False negatives happen more than labs admit
Standard Amsel criteria and even some swab tests miss 15–30% of BV cases. If the smell is persistent and fishy, ask for a pH test or Gardnerella-specific PCR.
Other infections that smell similar
Trichomoniasis (trich) produces a fishy smell identical to BV but requires different treatment. STI panels often exclude trich by default — you usually have to request it separately.
Retained tampon or foreign body
A forgotten tampon or contraceptive device causes acute fishy/rotten odor. If smell is sudden and severe, this is the first thing to rule out.
Dietary triggers
High-choline foods (eggs, fish, red meat) can produce fishy-smelling metabolites in women with a certain gut bacteria profile — TMAU. Usually constant, not linked to discharge.
Sweat and fabric interaction
Synthetic fabrics trap heat and moisture. The combination of skin bacteria + sweat + trapped air can produce a smell that's strongest through pants but minimal on underwear — completely normal.