Vaginal Discharge Management
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Direct answer
The three pH-and-microscopy diagnoses sort nearly every case of abnormal vaginal discharge: bacterial vaginosis — thin grey-white homogenous discharge, pH above 4.5, fishy smell intensified by 10 per cent potassium hydroxide (positive whiff test), clue cells on saline microscopy — treated with metronidazole 400 mg twice daily for seven days or clindamycin; vulvovaginal candidiasis — thick curdy white discharge with itching and soreness, pH below 4.5, pseudohyphae and budding yeast on 10 per cent KOH microscopy — treated with topical azoles (clotrimazole 500 mg vaginal tablet as a single dose is classic) or fluconazole 150 mg orally once; and trichomoniasis — frothy, greenish, malodorous discharge with a strawberry cervix, pH above 4.5, motile flagellates on saline wet mount — treated with metronidazole 2 g orally as a single dose and partner treatment, since it is sexually transmitted. Mucopurulent cervicitis (chlamydia, gonorrhoea) sits above the cervix with a friable cervix and needs systemic antibiotics; India's national STI programme uses syndromic management, treating by symptom-pattern when laboratory testing is unavailable.
What you must remember
- Physiological discharge: clear or white, non-irritating, non-malodorous, pH around 4.5, varying with the cycle — needs explanation and hygiene advice, not antibiotics.
- Bacterial vaginosis: grey thin discharge, pH over 4.5, whiff test positive, clue cells (epithelial cells studded with coccobacilli, edges obscured) over 20 per cent of epithelial cells; treat metronidazole 400-500 mg twice daily x 7 days (oral or 0.75 per cent gel) or clindamycin 300 mg twice daily x 7 days — treat in pregnancy when symptomatic or preterm-risk, as BV associates with preterm birth.
- Candidiasis: curdy discharge, intense itch, soreness, dysuria, pH under 4.5, budding yeast with pseudohyphae in KOH; clotrimazole 500 mg PV stat (or 200 mg x 3 nights), miconazole, or oral fluconazole 150 mg stat — oral azoles avoided in pregnancy; recurrent disease (four or more episodes a year) gets suppressive weekly fluconazole (non-pregnant) and diabetes or HIV screening.
- Trichomoniasis: frothy green discharge, strawberry cervix (cervicitis with petechiae), pH over 4.5, actively motile trichomonads on warm saline wet mount; treat metronidazole 2 g oral stat or 400 mg twice daily x 7 days — treat the partner simultaneously; treat in pregnancy (infection linked to preterm rupture and preterm birth).
- Cervicitis: mucopurulent discharge from the os, friable cervix on swab contact — treat for chlamydia (azithromycin 1 g oral stat) and gonorrhoea (ceftriaxone 500 mg IM stat per current national guidance) together, since dual infection is common.
- Syndromic management (NACO): anogenital sores, urethral discharge and vaginal discharge flow-charts treat the most likely organism mix at first contact without waiting for laboratory tests — the Indian public-health answer.
- When to suspect something worse: postcoital or intermenstrual bleeding points to cervicitis, polyps or cervical cancer — every persistent discharge deserves a speculum examination and, where indicated, a Pap smear.
- Hygiene counsel: avoid douching — it destroys lactobacilli and precipitates BV; cotton underwear and avoiding topical irritants are standard counselling points.
A discharge clinic worked through
Three consecutive patients, one algorithm. The first, a 24-year-old with a grey discharge smelling worse after intercourse: saline slide shows epithelial cells with blurred borders — clue cells — and adding KOH releases the amine odour. Bacterial vaginosis; metronidazole 400 mg twice daily for a week, no partner treatment, and a note that in pregnancy with prior preterm birth treatment would be mandatory rather than optional.
The second, a diabetic 32-year-old with three weeks of itching and a thick white discharge: pH 4.2, pseudohyphae on KOH. Candidiasis — with the exam question hiding in her diabetes, since recurrent candidiasis flags uncontrolled diabetes and HIV, so sugars are checked and recurrence prompts serology. She receives clotrimazole 500 mg as a single vaginal dose, topical rather than oral in case of pregnancy.
The third, a sex worker with frothy green discharge and a punctate red cervix: motile flagellates on warm saline. Trichomoniasis — metronidazole 2 g stat to her and her partner the same day, condom counselling, and syndromic chlamydia-gonorrhoea cover per the NACO flow-chart, since coinfection is common and laboratory confirmation may never arrive. One slide, three diagnoses, three different partner-management decisions — that contrast is what a viva examiner means by the approach to vaginal discharge.
The classic switch
The recurring mark-losers: treating physiological discharge with metronidazole (reassurance and hygiene is the answer); oral fluconazole for the pregnant candidiasis patient (topical azoles); forgetting partner treatment in trichomoniasis; and forgetting that bleeding with discharge demands a speculum examination and cancer exclusion before any syndromic label.
Frequently asked questions
How is bacterial vaginosis diagnosed at the bedside?
Thin grey discharge with pH above 4.5, a positive whiff test with 10 per cent KOH, and clue cells on saline microscopy — Amsel criteria.
What is the treatment of vulvovaginal candidiasis in pregnancy?
Topical azoles such as clotrimazole for the recommended duration — oral fluconazole is avoided in pregnancy.
Why is the partner treated in trichomoniasis but not in bacterial vaginosis?
Trichomoniasis is a sexually transmitted infection requiring simultaneous partner treatment to prevent ping-pong reinfection; bacterial vaginosis is a dysbiosis of vaginal flora, not classically sexually acquired.
What regimen covers both chlamydia and gonococcal cervicitis in syndromic management?
Azithromycin 1 g orally plus ceftriaxone 500 mg intramuscularly as single doses per national guidance, treating both organisms at first contact.
Which finding on wet mount is diagnostic of trichomoniasis?
Motile pear-shaped flagellated organisms swimming in a warm saline wet mount, typically with pH above 4.5.