White discharge in pregnancy
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vaginal discharge pregnancy management
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White (Vaginal) Discharge in Pregnancy
1. Normal Physiological Discharge (Leukorrhea)
White or clear vaginal discharge is common and often normal in pregnancy. Elevated estrogen levels increase cervical mucus production and vaginal secretions, leading to more noticeable discharge throughout gestation. Normal leukorrhea is:
- Thin, milky-white or clear
- Mild or odourless
- Non-irritating (no itching, burning, or soreness)
No treatment is needed for physiological leukorrhea. Reassurance is the appropriate response.
2. Pathological Causes of White Discharge in Pregnancy
When the discharge is excessive, thick, itchy, odorous, or associated with other symptoms, a pathological cause must be considered.
A. Vulvovaginal Candidiasis (Most Common Cause of White Discharge)
- Incidence is increased in pregnancy because high estrogen and progesterone levels reduce cell-mediated immunity - Berek & Novak's Gynecology
- Discharge: Thick, white, "cottage cheese" or curdy in appearance, adherent to vaginal walls
- Symptoms: Vulvar pruritus (the dominant symptom), soreness, dyspareunia, external dysuria ("splash dysuria"), erythema, and oedema of the labia
- pH: Normal (<4.5); KOH wet mount shows budding yeast or mycelia
- Whiff test: Negative
- No association with adverse pregnancy outcomes - treatment is for symptom relief only - Rosen's Emergency Medicine
Treatment in pregnancy:
- Oral azoles (e.g., fluconazole) are CONTRAINDICATED in pregnancy due to association with adverse fetal outcomes
- Topical intravaginal azoles (clotrimazole or miconazole) for 7 days are safe, with ~80% cure rate
- Over-the-counter topical preparations are appropriate first-line therapy - Rosen's Emergency Medicine
B. Bacterial Vaginosis (BV)
- Prevalence in pregnancy: 15-20%
- Caused by replacement of normal Lactobacillus flora with anaerobes (predominantly Gardnerella vaginalis)
- Discharge: Homogeneous, white-gray, adherent, with a fishy malodour (especially after intercourse)
- pH: >4.5; positive whiff test (fishy odour with KOH); clue cells on wet mount
- Amsel criteria (3 of 4): characteristic discharge, pH >4.5, positive whiff test, clue cells
Pregnancy complications of untreated BV:
- Chorioamnionitis
- Premature rupture of membranes (PROM)
- Preterm delivery / fetal prematurity
- Postpartum endometritis
- Increased risk of second-trimester pregnancy loss (association) - Rosen's Emergency Medicine, Berek & Novak's
Treatment:
- Oral metronidazole 500 mg twice daily for 7 days OR
- Oral clindamycin 300 mg twice daily for 7 days
- Intravaginal treatment is NOT recommended in pregnancy (systemic treatment preferred)
- Note: Metronidazole is contraindicated in the first trimester for BV/trichomoniasis - use clindamycin instead in T1 - Sabiston
C. Trichomoniasis
- Caused by Trichomonas vaginalis (sexually transmitted protozoan)
- 50% of women are asymptomatic
- Discharge: Classically greenish, frothy, malodorous (not white)
- Symptoms: vaginal itching, irritation
- Diagnosed by NAAT (preferred), wet mount (motile trichomonads), or rapid antigen test
- Associated with preterm birth and PROM
- Treatment in pregnancy: Single-dose metronidazole 2 g orally (avoid in first trimester)
3. Alarming Features - When to Investigate Urgently
| Feature | Concern |
|---|---|
| Blood-stained discharge | Threatened abortion, placenta praevia, cervical pathology |
| Profuse watery discharge | Premature rupture of membranes (PROM) |
| Yellow/green, purulent | Gonorrhoea, Chlamydia - cervicitis |
| Strong fishy odour | Bacterial vaginosis |
| Thick white + itch | Candidiasis |
| Associated pelvic pain | Pelvic inflammatory disease |
4. Diagnostic Approach (Per Speculum Examination)
From Park's Preventive & Social Medicine (syndromic management):
- Trichomoniasis - greenish, frothy discharge
- Candidiasis - curdy, white discharge
- Bacterial vaginosis - adherent, grey-white discharge, fishy odour
- Cervicitis - mucopurulent cervical discharge, cervical erosion/ulcer
Tests: vaginal pH, saline wet mount (clue cells, trichomonads), KOH preparation (yeast hyphae), whiff test, NAAT for T. vaginalis and cervical organisms
5. Summary Table
| Cause | Colour/Texture | Odour | pH | Itch | Treatment in Pregnancy |
|---|---|---|---|---|---|
| Physiological | Clear/white, thin | None | <4.5 | No | Reassurance |
| Candidiasis | White, curdy/thick | None | <4.5 | Yes (main symptom) | Topical azole x 7 days (no oral azoles) |
| Bacterial vaginosis | Grey-white, homogeneous | Fishy | >4.5 | No | Oral metronidazole or clindamycin x 7 days |
| Trichomoniasis | Greenish, frothy | Offensive | >4.5 | Sometimes | Metronidazole (avoid T1) |
Key clinical points:
- Most white discharge in pregnancy is physiological or candidal - reassurance and topical treatment respectively
- BV needs systemic treatment due to risk of preterm birth
- Any watery or blood-tinged discharge requires immediate assessment to rule out PROM or antepartum haemorrhage
- Always perform a speculum exam to differentiate vaginitis from cervicitis
(Sources: Rosen's Emergency Medicine; Berek & Novak's Gynecology; Symptom to Diagnosis: An Evidence-Based Guide; Park's Preventive & Social Medicine; Sabiston Textbook of Surgery)
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