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OverviewAetiologyPathophysiologyClinical features and red flagsInvestigationsDifferential diagnosisManagementComplicationsMonitoring and follow-upSpecial situationsCommon pitfallsQuestionsSources
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Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.

Postpartum endometritis and wound infection

Obstetrics and gynaecology · UK scope · Sources checked 7 Sept 2026 · Clinical review pending

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Pain and deterioration can precede fever

Postpartum infection with confusion, hypotension, breathlessness, oliguria or disproportionate perineal pain may represent sepsis or necrotising infection, even with a normal temperature.

Action: Arrange emergency hospital assessment, involve senior obstetrics and anaesthesia, obtain urgent cultures and lactate without delaying intravenous antibiotics, and seek immediate surgical assessment when tissue necrosis is possible.

Overview

Recognise uterine and birth wound infection after discharge, identify maternal sepsis promptly, and coordinate antimicrobial treatment with drainage or removal of an infected focus.

Postpartum endometritis is infection of the uterine lining and adjacent tissues after birth. Women may first contact a community midwife or GP because bleeding has increased, discharge smells different, pelvic pain is worsening or they feel unexpectedly unwell. Ask when symptoms started and how quickly they are changing. A woman who was well at discharge may develop serious infection several days later; previous reassuring observations describe an earlier moment.

Distinguish the suspected anatomical source from the severity of the response. A tender uterus with offensive lochia suggests genital infection, while erythema and discharge at a caesarean incision suggest a wound focus. Neither description establishes whether the patient is physiologically stable. Record respiratory rate, oxygen saturation, heart rate, blood pressure, temperature, conscious level and urine output, using the local obstetric early warning system. Escalate a concerning clinical trajectory even when a calculated score is modest.

Practice

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Obstetrics and gynaecologyOriginal SBA

Maternal sepsis fluid bolus

A woman on day five after caesarean birth has suspected uterine sepsis, blood pressure 84/48 mmHg and no signs of fluid overload. The team is initiating NICE NG255 fluid resuscitation. Which initial prescription matches that guideline?

Choose one answer, then submit
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Sources and review status6 sources · checked 7 Sept 2026 · clinical review pending+
Sources

Sources and review status

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.

  • RCOG Green-top guideline 64 maternal sepsis
  • NICE NG255 maternal sepsis antibiotics fluids and oxygen
  • NHS Lothian endometritis antimicrobial prescribing
  • NICE NG141 cellulitis antimicrobial prescribing
  • NICE NG194 postnatal care recommendations
  • RCOG maternal sepsis guideline June 2026 correction

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateComplete draft
Birth creates several possible routes for infection. The placental bed and damaged genital tissues are healing surfaces; surgery introduces an incision and sometimes a collection beneath it. Retained placental tissue or a haematoma can sustain infection. Review prolonged membrane rupture, intrapartum infection, repeated examinations, instrumental procedures, caesarean birth and antibiotic exposure, but do not require a risk factor before examining a symptomatic woman.

Examination should answer practical questions: is the infection uterine, superficial, deep, urinary or elsewhere; is there a collection; and is source control urgent? Explain the need for abdominal, wound and, when indicated, speculum or vaginal examination. Provide a chaperone and appropriate analgesia. Do not repeatedly squeeze a painful wound or assume that distress makes the findings unreliable. Severe pain extending beyond visible erythema is a reason to reconsider the depth and urgency of infection.

Antimicrobial selection depends on illness severity, probable organisms, allergy history, recent cultures and local resistance. Genital infection can be polymicrobial and requires appropriate broad coverage. A narrow skin regimen suitable for uncomplicated superficial cellulitis is not interchangeable with treatment for uterine infection or a deep perineal wound. Record the specific allergy reaction; a vague penicillin allergy label should trigger clarification, not an improvised substitute.

Recovery requires more than a falling temperature. Establish whether pain, uterine tenderness, discharge, circulation and functional ability are improving. Persistent fever or deterioration prompts a search for retained tissue, abscess, resistant organisms or an alternative diagnosis, including thrombosis. Plan who reviews culture results after discharge, checks wounds and explains recurrent symptoms. Discuss feeding and infant care so that essential treatment is delivered while preserving practical support for the family.

Key points

  • Endometritis is a clinical diagnosis supported by examination and investigations.
  • Inspect the caesarean or perineal wound with consent and adequate analgesia.
  • A small skin opening can conceal a substantial deeper collection.
  • High-risk maternal sepsis needs intravenous antibiotics within one hour.
  • Use the pregnancy-specific NICE fluid pathway during the first six postpartum weeks.
  • Antibiotics cannot compensate for an undrained abscess or necrotic tissue.

Aetiology

01

Ascending genital bacteria

Organisms from the genital tract can invade injured uterine tissues after delivery. Infection may involve several bacterial groups, which explains why narrow skin coverage is often inadequate.

02

Surgical and retained foci

An infected incision, haematoma or retained placental fragment can sustain bacterial growth. The underlying focus influences whether antimicrobials alone can produce lasting improvement.

Pathophysiology

  1. 1
    Local inflammation

    Inflammation in the uterine wall and healing placental bed produces tenderness and disturbed involution. Tissue injury may contribute to persistent or increasing postpartum bleeding.

  2. 2
    Deep tissue spread

    Infection can extend beyond an externally visible wound into deeper planes. Pressure, ischaemia and necrosis may generate severe pain before extensive skin changes appear.

  3. 3
    Organ dysfunction

    An uncontrolled host response can impair perfusion and damage kidneys, lungs, circulation and brain. Detecting these effects changes the urgency of treatment regardless of recorded temperature.

Clinical features and red flags

Uterine infection

Lower abdominal pain, uterine tenderness, offensive lochia and abnormal bleeding support endometritis. Fever may occur, but its absence does not exclude invasive infection or justify delayed assessment.

Caesarean wound changes

Increasing incisional pain, warmth, erythema, purulent discharge or separation require direct inspection. Ask about a new swelling or watery discharge that might indicate a deeper collection or fascial problem.

Perineal wound breakdown

Escalating pain, wound gaping, malodour or difficulty sitting and walking warrant examination. Consider anal sphincter injury, haematoma and abscess when symptoms are more severe than expected.

Systemic physiological change

Rigors, tachypnoea, altered cognition, mottling or reduced urine production suggest significant illness. Relatives may describe a striking change before standard observations become profoundly abnormal.

Non-genital sources

Assess urinary symptoms, flank pain, cough, breast inflammation and vascular access sites. A postpartum patient can have pneumonia or pyelonephritis alongside a healing, uninfected birth wound.

Red flags requiring action

  • Rapidly worsening abdominal or perineal pain with systemic illness.
  • New confusion, low blood pressure or markedly reduced urine output.
  • Spreading wound discolouration, skin blistering or crepitus.
  • Heavy bleeding together with offensive discharge and uterine tenderness.

Investigations

  1. 01
    Blood cultures and lactateFirst step
    Why
    Identify bloodstream infection and assess impaired perfusion promptly.
    Interpretation and limitations
    Take cultures before antibiotics when this causes no meaningful delay. A normal lactate does not exclude infection; an elevated result or worsening trend supports urgent senior reassessment.
  2. 02
    Full blood count renal liver and clotting tests
    Why
    Detect organ dysfunction and establish prescribing baselines.
    Interpretation and limitations
    Physiological postpartum leucocytosis limits the specificity of an isolated white cell count. Platelet fall, kidney injury or abnormal coagulation carry greater concern when interpreted with the clinical course.
  3. 03
    Targeted microbiology
    Why
    Obtain samples from a clinically plausible source.
    Interpretation and limitations
    Send urine culture and appropriate wound or genital samples according to findings. Superficial colonisation is possible, so a swab result should not replace assessment of deeper infection.
  4. 04
    Pelvic ultrasound
    Why
    Assess retained tissue or a pelvic collection.
    Interpretation and limitations
    Intrauterine material can represent normal postpartum contents or clot. Interpret imaging with bleeding, tenderness and systemic findings; an equivocal scan cannot safely overrule a deteriorating patient.

Differential diagnosis

01

Retained products without infection

Retained tissue can cause bleeding and uterine subinvolution without systemic infection. Clinical findings and imaging guide the distinction, and both processes may coexist.

02

Urinary infection

Dysuria, loin tenderness or urinary instrumentation suggest a urinary source. Fever or sepsis after birth should not automatically be attributed to the uterus.

03

Pelvic venous thrombosis

Persistent fever and pelvic pain despite adequate antimicrobial treatment may warrant evaluation for pelvic thrombosis. This requires senior assessment and appropriate imaging rather than repeated empirical antibiotic changes.

Management

01CommunityEscalate a symptomatic postpartum contactFirst stepEscalationNew pelvic pain discharge or wound symptoms develop after discharge.+
  1. 1Assess the severity immediately and arrange emergency transport for physiological compromise or rapidly advancing pain.
  2. 2Arrange same-day maternity or acute assessment when uterine infection, wound breakdown or a deep collection is suspected.
  3. 3Send the birth summary, allergy details and recent antibiotic history with a clear account of symptom progression.
02High riskTreat maternal sepsis and locate the focusInfection is accompanied by high-risk features or acute organ dysfunction.+
  1. 1Call the senior obstetric and anaesthetic teams and obtain intravenous access, cultures, lactate and organ function tests.
  2. 2Administer appropriate broad-spectrum intravenous antibiotics within one hour for high-risk sepsis, adapting to the local maternal regimen.

Complications

01

Septic shock

Progressive infection may cause hypotension and inadequate tissue perfusion despite initial treatment. Prompt escalation enables vasopressor support and definitive source control when required.

02

Abscess and wound failure

Local infection may produce a collection or disrupt tissue repair. Drainage, debridement and specialist wound planning may be needed in addition to antimicrobial treatment.

03

Recovery disruption

Pain, readmission and separation from the infant can impair feeding, mobility and psychological recovery. Discharge planning should address these consequences as well as laboratory improvement.

Monitoring and follow-up

  • Repeat physiological observations at a frequency determined by severity, recording urine output and the response to each intervention rather than relying on a single improvement.
  • Review microbiology promptly and narrow or alter treatment with clinical context; document who is responsible for results that return after discharge.
  • Assess wound depth, drainage, surrounding inflammation and pain at review, including whether the woman can mobilise, pass urine and care for herself.
  • Reassess venous thromboembolism risk during infection and hospital admission, balancing prophylaxis against active bleeding and planned procedures.
  • Discuss maternal drug compatibility with breastfeeding and investigate an unwell infant separately; maternal infection does not provide a complete explanation for neonatal symptoms.

Special situations

Pain out of proportion

A severely painful perineum with limited skin changes may reflect a deep process. The decision to obtain urgent surgical advice depends on the whole presentation, not the size of the visible lesion.

Retained tissue and infection

Antibiotics may temporarily reduce fever while infected retained products remain. Continued bleeding or tenderness should prompt senior review of whether uterine source control is needed.

Invasive streptococcal infection

Suspected invasive group A streptococcal disease requires urgent infection specialist and infection prevention involvement, including assessment of the mother–baby pair and relevant contact management.

Unexpected deterioration

RCOG's June 2026 correction specifies intravenous aciclovir 10 mg/kg every 8 hours when specialists consider adding HSV treatment after deterioration despite initial antibiotics. Adjust for renal function; this is not routine endometritis therapy.

Common pitfalls

  1. 01

    Treating every postpartum fever as endometritis without examining the chest, urine and wounds can miss the actual focus.

  2. 02

    A reassuring wound swab or modest inflammatory marker must not delay action for progressive pain and systemic compromise.

  3. 03

    Using a routine non-pregnant sepsis fluid volume automatically overlooks the specific NG255 maternal recommendation.

  4. 04

    Sending a woman home with antibiotics without arranging review leaves abscess, wound breakdown and deteriorating sepsis unrecognised.

Clinical stateAwaiting review
JurisdictionUnited Kingdom
05
Cross-sectional imaging or surgical exploration
Why
Define deep infection when initial assessment is insufficient.
Interpretation and limitations
CT may reveal collections or other abdominal pathology. Suspected necrotising infection requires immediate surgical discussion; do not delay necessary exploration while seeking perfect imaging confirmation.
  • 3If fluid resuscitation is required in an adult within six weeks of pregnancy, give the NG255 initial 500 mL crystalloid bolus and reassess immediately.
  • 4Arrange urgent drainage, debridement or management of retained tissue where indicated; involve microbiology and critical care early.
    • 03Local infectionTreat a stable wound or uterine focusExamination identifies infection without haemodynamic compromise or urgent surgical features.+
    1. 1Separate superficial incisional cellulitis from uterine or deep genital infection before selecting an antibiotic regimen.
    2. 2Use local obstetric antimicrobial guidance and organise drainage or wound management when a collection or breakdown is present.
    3. 3Set a defined review interval and explain that spreading pain, systemic symptoms or failure to improve needs earlier reassessment.
    04ReassessmentInvestigate treatment failure and support dischargeSymptoms persist despite treatment or the patient is preparing to leave hospital.+
    1. 1AlternativeRevisit source control, microbiology, antibiotic exposure and alternative diagnoses rather than merely extending the same prescription.
    2. 2Agree an oral switch only when clinically appropriate, with the total course counting intravenous and oral treatment together.
    3. 3Provide a named follow-up route, wound care advice and a plan for practical infant care during recovery.
    Key medicines and prescribing safety3 treatments · regimens, roles and cautions+
    Illustrative local regimen for postpartum uterine infection; severe sepsis requires the full local escalation regimen.

    Co-amoxiclav for postpartum endometritis

    NHS Lothian example: 1.2 g intravenously every 8 hours, switching when appropriate to 625 mg orally every 8 hours; total intravenous plus oral course 7 days.

    Check immediate penicillin allergy, renal function and previous co-amoxiclav-associated liver injury. Hypotensive sepsis may require additional agents under obstetric and microbiology advice. Confirm the locally approved obstetric antibiotic schedule before prescribing.

    Treats susceptible skin infection when assessment excludes a uterine or deep polymicrobial focus.

    Flucloxacillin for uncomplicated superficial cellulitis

    NICE adult oral regimen: 500 mg to 1 g four times daily for 5–7 days, with clinical review if worsening or failing to improve.

    Avoid in penicillin hypersensitivity and previous flucloxacillin-associated hepatic injury. Significant systemic illness, abscess or genital tract infection requires a different assessment and potentially broader intravenous treatment.

    Supports circulation during suspected sepsis with inadequate perfusion or haemodynamic compromise.

    Isotonic crystalloid for maternal sepsis resuscitation

    For adults who are recently pregnant and need resuscitation, give 500 mL intravenously over less than 15 minutes, then reassess; further boluses depend on response.

    Use sodium concentration 130–154 mmol/L. Review breathing and signs of overload after each bolus, especially with pre-eclampsia or cardiac disease; persistent compromise needs consultant and critical care input.