Confirm membrane rupture before 37 weeks, detect infection or fetal danger, and balance safe pregnancy prolongation against the need for birth.
Membrane rupture removes part of the barrier between the intrauterine environment and vaginal microorganisms and can reduce the volume of fluid protecting the fetus. Presentation ranges from a dramatic gush to intermittent dampness that is difficult to distinguish from urine or normal discharge. Establish the onset, persistence, colour and smell of leakage, associated contractions, bleeding, maternal illness and fetal movements. Gestation at rupture and the amount of fluid remaining affect prognosis, particularly with very early and prolonged oligohydramnios. RCOG Green-top 73 covers 24+0–36+6 weeks; earlier rupture requires a separate specialist periviable discussion.
Diagnosis uses history and sterile speculum examination. If amniotic fluid is visibly pooling, further biochemical confirmation is unnecessary. If no fluid is seen, an IGFBP-1 or PAMG-1 assay intended for membrane rupture can guide assessment. A positive result alone does not settle management: consider gestation, symptoms, examination and possible contamination, and either treat as PPROM or reassess later. When both pooling and the test are negative, PPROM is unlikely and routine latency antibiotics are not indicated, but recurrent leakage or labour symptoms should bring the patient back. Ultrasound fluid volume can support the assessment but is neither sufficient to confirm nor exclude a small leak.
Inflammation, mechanical stress and altered membrane integrity can permit rupture before labour, with previous PPROM increasing the likelihood in a future pregnancy.
Cervical shortening, genital tract infection, bleeding and uterine overdistension may coexist, although an individual episode often has no single identifiable cause.
Rupture opens a route for ascending microorganisms and reduces the protection provided by intact membranes, increasing the risk of maternal and fetal infection.
Escaping amniotic fluid can promote cord compression and, when very early and prolonged, interfere with fetal lung development and normal limb movement.
Inflammatory pathways and changing intrauterine conditions can initiate contractions, while the associated risk of abruption creates an additional route to urgent delivery.
A continuing trickle that repeatedly wets underwear can represent membrane rupture even when the initial loss was small and contractions are absent.
Fever, tachycardia, feeling increasingly unwell or uterine tenderness can precede a dramatic inflammatory-marker rise and require urgent assessment.
Sudden fetal bradycardia, bleeding or severe pain may indicate cord prolapse, compression, abruption or another complication of membrane rupture.
Prolonged rupture early in pregnancy can impair lung development and requires careful counselling about uncertainty and gestation-specific outcomes.
Stress incontinence can produce wetness in later pregnancy; the history and speculum findings help distinguish it without dismissing persistent unexplained watery loss.
Increased vaginal secretions or infection may mimic a slow amniotic leak, requiring examination and targeted testing rather than diagnosis from appearance alone.
Contractions and cervical change can occur before membranes rupture, and this distinct pathway uses different biomarkers and different considerations for tocolysis.
Ascending infection can cause chorioamnionitis, maternal sepsis and neonatal infection, demanding prompt recognition and treatment with reassessment of whether pregnancy can safely continue.
Reduced fluid or membrane opening with a high presenting part may permit compression or prolapse, producing sudden fetal compromise that requires urgent intervention.
Early birth causes gestation-related neonatal morbidity, while very early prolonged oligohydramnios can limit lung growth and substantially complicate prognosis.
Latency prophylaxis and intrapartum neonatal GBS prevention address different risks; completing the oral course does not remove the later intravenous indication.
A threatened-labour assay is not a substitute for a rupture assay, even where brand names or biomarker families sound similar.
The general option of waiting towards 37 weeks must be reconsidered when a current-pregnancy GBS-positive result meets NICE's immediate-birth criteria.
Before the usual guideline gestational range, neonatal prognosis, maternal infection risk and the patient's wishes require an individual multidisciplinary discussion.
Prescribing co-amoxiclav routinely to prolong latency in PPROM.
Diagnosing chorioamnionitis from an isolated raised CRP or excluding it from a normal white-cell count.
Repeating digital vaginal examinations without a clear management-changing reason after membranes have ruptured.
Assuming every stable late-preterm PPROM case should wait until 37 weeks despite current-pregnancy GBS positivity.
Your practice draft is saved in this browser.
At 29 weeks, PPROM is confirmed by visible pooling on speculum examination. The patient is clinically well, tolerates erythromycin, has no drug allergy and is not in established labour. Which antibiotic prophylaxis is recommended by NICE?
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 7 Sept 2026; clinical approval remains outstanding.
Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes
Management involves two parallel questions: whether mother and fetus are safe now, and what would change that judgement. Chorioamnionitis cannot be diagnosed from CRP, white-cell count or a fetal trace alone. Combine the clinical course, observations, abdominal findings, laboratory trends and fetal assessment. Steroids themselves can affect white-cell counts, and normal markers early in infection do not justify ignoring deterioration. New fever, tachycardia, tenderness, offensive fluid or fetal concern warrants senior review and appropriate treatment. Tocolysis is not routinely recommended for PPROM.
Antibiotic prophylaxis aims to reduce intrauterine infection and prolong latency, while intrapartum GBS prophylaxis serves a separate neonatal prevention purpose. Oral erythromycin does not replace treatment of maternal sepsis or the indicated intravenous intrapartum regimen. If stable without contraindications to continuation, RCOG supports expectant management until 37+0 weeks. NICE advises discussion of expectant care versus induction after 34+0 weeks and offers immediate birth when a GBS test was positive during the current pregnancy in that late-preterm interval. Individualise the plan with neonatal capacity, the patient's preferences and changes in clinical condition.
Check allergy, QT-prolonging interactions and intolerance. Consider an oral penicillin if erythromycin is unsuitable; do not choose co-amoxiclav for this prophylactic indication.
Assess the nature of any penicillin allergy and use the appropriate alternative pathway; suspected maternal infection needs treatment broad enough for the likely source rather than prophylaxis alone.