Symptom → lab tests
Which test should you get for vaginal odor?
Short answer
A fishy odor — strongest after sex or during a period — is the signature of bacterial vaginosis, and trichomoniasis can produce it too. Neither responds to the antifungals sold for yeast. One swab tested for BV, yeast and trichomonas identifies the cause; a positive BV result is treated with a short course of metronidazole or clindamycin.
Medically reviewed by Youmna DiStefano, MD · Last reviewed November 2026
When should you see a clinician instead of ordering a test?
- Odor with pelvic pain, fever or pain during sex — same-day care
- A foul (not fishy) odor with a forgotten tampon or other retained object — see a clinician for removal
- Odor with bleeding between periods, after sex or after menopause — an exam
- Symptoms in pregnancy — through your obstetric clinician
Why these tests for vaginal odor?
The odor comes from amines released by the anaerobic bacteria that overgrow in BV, which is why it is one of the four clinical criteria clinicians use to diagnose it. A molecular swab confirms BV directly and checks for trichomonas, the other common cause, and for yeast.
Odor with itching, burning or a change in discharge is the same work-up; with a new partner, chlamydia and gonorrhea are tested at the same time because BV raises the risk of acquiring them.
Odor alone, with a normal swab, is usually not a treatable infection — sweat, retained tampons, diet and hygiene products are the common explanations, and douching makes BV more likely rather than less.
Which conditions do these tests help evaluate?
- Bacterial Vaginosis (BV) — One swab that tells BV, yeast and trichomonas apart — plus the STI tests to add with a new partner.
Which tests, and what do they cost?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| STI Basic PanelSaves $5.99 vs ordering the tests separately | Panel · 2 tests | $84.99 | No | 2–5 business days |
| Vaginitis Panel (BV, Yeast & Trichomonas) | Test · 3 biomarkers | $149.99 | No | 1–3 business days |
| Chlamydia & Gonorrhea Test (RNA, Urine) | Test · 2 biomarkers | $51.99 | No | 1–4 business days |
| Urinalysis with Reflex to Culture | Test · 10 biomarkers | $19.99 | No | 2–4 business days |
Common questions
Does a fishy smell always mean BV?
Usually, but not always — trichomoniasis causes it too, and a retained tampon causes a foul odor that is different. The swab for BV, yeast and trichomonas tells them apart; the point is that none of the three is treated with the antifungals sold over the counter.
Can a BV test be done without a doctor?
Yes. The Vaginitis Panel is ordered online, authorized by a licensed physician, and self-collected in a private restroom at Quest; results post in one to three business days. A positive BV or trichomonas result then needs a prescription, which your clinician or a telehealth visit can provide from the lab report.
Will BV go away on its own?
Sometimes, but symptomatic BV is treated because it is uncomfortable and raises the risk of acquiring STIs and, in pregnancy, of preterm birth. Treatment is a week or less of metronidazole or clindamycin; recurrence is common, and repeat episodes have their own management.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.