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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.

Maternal sepsis and critical illness

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

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Suspected infection with maternal deterioration

A pregnant or recently pregnant patient with altered mental state, marked tachypnoea, hypotension, hypoxaemia or reduced urine output may have sepsis despite a normal temperature. Rapid progression can occur before a source becomes obvious.

Action: Activate emergency assessment and obtain senior obstetric, anaesthetic and medical support. In the community, arrange immediate emergency transfer and pre-alert the receiving team. In hospital, assess ABCDE, obtain lactate and cultures promptly, give indicated intravenous antibiotics within one hour of high-risk recognition, and begin monitored resuscitation and source investigation.

Overview

Recognise infection with maternal organ dysfunction, initiate timely resuscitation and antimicrobial treatment, and coordinate source control, obstetric decisions and recovery after critical illness.

Maternal sepsis is organ dysfunction caused by an abnormal host response to infection during pregnancy or following its end. It is a clinical syndrome, not simply a positive culture or a high inflammatory marker. The infection may arise in the uterus, urinary tract, lungs, a surgical wound or another site. Pregnancy increases circulatory demand and changes baseline observations, while young patients may maintain blood pressure until deterioration is advanced. Effective care therefore joins the patient's story, repeated physiology and a search for organ dysfunction rather than waiting for every classic feature.

The first phase of care has several simultaneous objectives: support oxygenation and perfusion, give appropriate antimicrobials, identify the source and organise definitive control. Obstetric and critical care decisions should develop alongside these steps. Fetal compromise may reflect maternal hypoxia or shock and often requires maternal resuscitation before the significance of the fetal trace can be judged. The decision to expedite birth depends on the source, gestation and maternal and fetal condition; a respiratory infection does not create the same source-control question as infected retained products or intrauterine infection.

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Obstetrics and gynaecologyOriginal SBA

The first-hour response

Four days after caesarean birth, a patient presents with worsening abdominal pain, confusion, pulse 138/minute and systolic blood pressure 86 mmHg. Her temperature is 37.1°C. What is the most appropriate immediate approach?

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Sources and review status7 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.

  • NICE NG255 managing suspected maternal sepsis
  • NICE NG255 antimicrobial fluid and oxygen treatment
  • NICE NG255 full guideline through NCBI Bookshelf
  • RCOG Green-top 64 identification and management of maternal sepsis
  • RCOG maternal sepsis full guideline publication
  • Piperacillin tazobactam product characteristics
  • Clindamycin intravenous product characteristics

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

Authoring stateComplete draftClinical stateAwaiting review

Key points

  • NICE NG255 is the pregnancy and recently pregnant sepsis guideline; use its population-specific risk assessment rather than automatically applying the general adult NEWS2 pathway.
  • Recently pregnant includes the six weeks after birth, miscarriage or termination, so establish pregnancy history in any unwell patient.
  • A normal temperature or an initially normal blood pressure cannot reliably exclude serious maternal infection.
  • High-risk suspected sepsis requires prompt broad-spectrum intravenous antimicrobials, within one hour of identifying a high-risk criterion.
  • Obtain appropriate cultures before treatment when this can be achieved promptly; difficult sampling must not create harmful antibiotic delay.
  • Reassess after each fluid bolus and obtain early critical care input when shock, respiratory failure or organ dysfunction persists.
  • Antibiotics and resuscitation do not replace drainage, debridement or removal of infected retained pregnancy tissue when source control is needed.

Aetiology

01

Genital and procedural infection

Endometritis, infected retained pregnancy tissue and infection following caesarean or perineal trauma can progress to systemic illness. Recent miscarriage or termination is relevant even when no ongoing pregnancy is visible.

02

Non-obstetric infectious sources

Urinary, respiratory, abdominal and skin infections can cause maternal sepsis. The likely organism depends on the anatomical source, recent healthcare exposure, previous antibiotics and known resistant-organism carriage.

03

Host and exposure factors

Immunosuppression, diabetes, invasive procedures and prolonged rupture of membranes may increase vulnerability. Household exposure to invasive streptococcal disease or a history of resistant infection can influence assessment and empirical treatment.

Pathophysiology

  1. 1
    Dysregulated inflammatory response

    Infection can trigger widespread endothelial and inflammatory changes that impair normal organ function. Severity depends on the host response and tissue effects rather than the presence of fever or bloodstream culture positivity alone.

  2. 2
    Circulatory and microvascular failure

    Vasodilatation, capillary leak and altered microcirculatory flow can reduce effective tissue perfusion. Blood pressure may initially remain maintained, while lactate elevation, confusion or oliguria reveal developing physiological compromise.

  3. 3
    Toxin-mediated tissue injury

    Some streptococcal and staphylococcal infections release toxins that amplify systemic inflammation and local damage. Antibiotic selection and timely removal of infected or necrotic tissue address different parts of this process.

  4. 4
    Pregnancy-related physiological demand

    Maternal oxygen consumption and circulatory demand are already increased during pregnancy. Infection-associated hypoxaemia and shock can therefore compromise both maternal organs and placental oxygen delivery, affecting fetal wellbeing.

Clinical features and red flags

An infection history beyond fever

Ask about rigors, feeling unusually unwell, breathlessness, urinary symptoms, abdominal or pelvic pain, diarrhoea, wound changes and breast symptoms. Clarify recent procedures, rupture of membranes, delivery, miscarriage or termination. Contact with group A streptococcal disease and prior resistant organisms can change the likely pathogens and treatment.

Physiology that indicates organ stress

Record respiratory rate, pulse, blood pressure, oxygen saturation, temperature, mental state and urine output. Tachypnoea may precede hypotension. Interpret observations against earlier values and medicines such as beta-blockers, which may blunt tachycardia. Use the pregnancy-specific risk criteria together with clinical assessment and an appropriate maternity warning system.

Genital tract and wound sources

Endometritis may present with uterine tenderness, pelvic pain, abnormal bleeding or discharge, but invasive streptococcal disease can have little offensive discharge. Inspect caesarean and perineal wounds when relevant. Severe pain with modest external changes should prompt consideration of a deeper necrotising infection.

Comorbidity and repeated presentations

Diabetes, immunosuppression, invasive procedures and prolonged membrane rupture increase concern. A patient who has already sought help and is worsening needs reassessment of the entire illness, even if earlier observations were reassuring. Communication barriers should lead to additional history support rather than a lower estimate of risk.

Concurrent noninfective critical illness

Pulmonary embolism, haemorrhage, cardiomyopathy, eclampsia and diabetic ketoacidosis can resemble or accompany sepsis. Review these possibilities during resuscitation. Do not

Investigations

  1. 01
    Blood gas with lactate and glucoseFirst step
    Why
    Assess perfusion, metabolic disturbance and early treatment response.
    Interpretation and limitations
    An elevated lactate strengthens concern but is not specific for infection. Interpret it alongside labour, seizures, circulation and organ function, then repeat according to severity and response. A low initial lactate does not neutralise high-risk clinical observations.
  2. 02
    Cultures and targeted microbiological samples
    Why
    Identify pathogens and support later antimicrobial refinement.
    Interpretation and limitations
    Obtain blood cultures and relevant urine, wound, respiratory or genital samples promptly before antibiotics when feasible. Sampling should be directed by the source and should not postpone urgent therapy. Negative cultures do not exclude infection after prior treatment or in a clinically convincing presentation.
  3. 03
    Full blood count, renal and liver tests
    Why
    Detect organ dysfunction and establish treatment monitoring baselines.
    Interpretation and limitations
    Assess creatinine, electrolytes, platelets and hepatic abnormalities alongside the clinical picture. Pregnancy and labour can increase the white cell count, making an isolated leucocytosis nonspecific. Falling platelets or rising creatinine may reveal worsening illness despite an improving temperature.
  4. 04
    Coagulation studies and additional blood testing

Differential diagnosis

01

Haemorrhagic or cardiogenic shock

Bleeding and cardiac dysfunction may cause tachycardia, hypotension and poor perfusion. Examination, bleeding assessment and focused imaging help distinguish mechanisms, which may coexist and require different fluid and definitive treatment strategies.

02

Pulmonary embolism

Sudden dyspnoea, hypoxaemia, chest pain or collapse requires consideration of thromboembolism. An infection history does not exclude concurrent thrombosis, and unexplained respiratory compromise should prompt appropriate investigation.

03

Hypertensive or metabolic illness

Eclampsia, severe pre-eclampsia and diabetic ketoacidosis can produce neurological or systemic deterioration. Check blood pressure, glucose, ketones and relevant organ studies while treating immediate threats.

04

Noninfective fever

Epidural-associated temperature elevation or a medicine reaction may cause pyrexia during labour. These explanations require assessment for infection and should not be used to dismiss organ dysfunction or progressive symptoms.

Management

01High-risk presentationTreat and escalate within the first hourFirst stepEscalationSuspected infection is accompanied by at least one high-risk pregnancy sepsis criterion.+
  1. 1Request immediate assessment by a senior clinical decision maker, discuss with a consultant and involve maternity, anaesthesia and critical care according to the pattern of deterioration.
  2. 2Assess airway and breathing, provide oxygen when needed to reach the appropriate target, establish intravenous access and obtain blood gas, cultures and organ-function studies.
  3. 3Administer broad-spectrum intravenous antimicrobials without delay and within one hour of high-risk recognition. Select coverage using the likely source, allergy history, recent antibiotics and resistant-organism risk, with early infection specialist advice.
  4. 4Give monitored intravenous crystalloid

Complications

01

Multiorgan dysfunction

Severe infection can impair respiratory, renal, neurological, hepatic and cardiovascular function. Persistent deterioration requires critical care assessment for organ support alongside continued attention to antimicrobial effectiveness and source control.

02

Coagulopathy and thrombosis

Systemic inflammation can activate coagulation and cause disseminated intravascular coagulation, bleeding or microvascular injury. Concurrent immobility and maternal risk factors also increase venous thromboembolism risk during recovery.

03

Fetal and neonatal consequences

Maternal hypoxaemia, shock and intrauterine infection can affect fetal wellbeing and necessitate preterm birth. Neonatal evaluation depends on the source, timing, gestation and treatment already given to the mother.

04

Persistent recovery needs

Survivors may experience weakness, fatigue, cognitive changes or psychological distress after the infection resolves. Recovery can affect parenting and feeding, requiring coordinated follow-up rather than discharge based solely on normal observations.

Monitoring and follow-up

  • Record observations and the response to every major intervention, including oxygen requirement, perfusion, mental state and cumulative intravenous fluid.
  • Measure urine output accurately when indicated, often with a catheter and hourly charting in severe illness; reassess renal function and drug clearance as the condition evolves.
  • Repeat lactate and relevant blood studies according to clinical severity, interpreting persistent abnormalities alongside circulation and source control.
  • Review antimicrobial choice when cultures or imaging clarify the source; document duration, opportunities to narrow treatment and criteria for switching from intravenous to oral therapy.
  • Assess recovery needs after critical illness, including weakness, sleep disturbance, psychological distress, infant feeding and the effect of separation from the baby.
  • Ensure the discharge summary names sepsis, records unresolved organ dysfunction and assigns follow-up responsibilities to maternity, primary care and relevant specialist teams.

Special situations

The maternity fluid pathway remains distinct

NG255 retains a 500 mL adult resuscitation bolus. The revised 250 mL initial bolus in the general adult NG253 pathway should not be silently substituted when explaining the pregnancy-specific NICE recommendation; individual fluid tolerance still requires clinical judgement.

A falling temperature is not recovery

Antipyretics can improve temperature without correcting poor perfusion. Assess respiratory effort, urine output, consciousness and lactate trajectory before concluding that treatment is succeeding or reducing the level of observation.

Necrotising infection needs early surgery

Deep tissue infection may produce extreme pain before dramatic skin findings appear. Waiting for a mature abscess, extensive discolouration or a definitive culture can delay the intervention that removes the source of ongoing toxin release.

Treatment coverage has boundaries

Piperacillin–tazobactam does not guarantee MRSA coverage and may be unsuitable for resistant Gram-negative bacteraemia. A microbiology history and a careful description of any previous antibiotic reaction can change the initial regimen immediately.

Maternal and neonatal plans must connect

Maternal resuscitation remains central, but neonatal assessment depends on the infection, gestation, timing of birth and antibiotic exposure. Passing this information directly avoids treating the baby's risk as an unrelated issue after delivery.

Common pitfalls

  1. 01

    Waiting for fever or a positive culture before recognising maternal sepsis.

  2. 02

    Using a reassuring fetal heart trace as evidence that maternal shock has resolved.

  3. 03

    Applying a generic adult scoring threshold without the pregnancy-specific criteria and clinical context.

  4. 04

    Continuing fluid boluses despite new crackles, increasing oxygen need or absent haemodynamic response.

  5. 05

    Assuming antibiotics alone will cure infected retained products or a necrotising wound.

  6. 06

    Discharging after temporary symptomatic improvement without documenting repeat observations and clear instructions for deterioration.

JurisdictionUnited Kingdom
allow an initial sepsis label to stop investigation of unexplained hypoxaemia, neurological signs, major bleeding or metabolic disturbance.

Red flags requiring action

  • New confusion, unusual behaviour, reduced consciousness or a family report that the patient is markedly different from usual.
  • Respiratory rate of 25/minute or above, escalating oxygen requirement or blue, mottled or ashen skin.
  • Systolic pressure of 90 mmHg or less, substantial fall from baseline, or heart rate above 130/minute with suspected infection.
  • No urine for 18 hours, measured oliguria or biochemical evidence of acute kidney injury.
  • Severe wound or perineal pain out of proportion to visible changes, spreading bruising or rapidly worsening abdominal pain.
Why
Identify coagulopathy and guide procedures or transfusion planning.
Interpretation and limitations
Request a clotting screen and consider fibrinogen, group and save or crossmatch according to bleeding and procedural risk. Severe infection can cause disseminated intravascular coagulation, while haemorrhage may coexist. Repeated results help guide treatment as physiology changes.
  • 05
    Source-directed imaging and fetal assessment
    Why
    Locate treatable infection and assess pregnancy consequences.
    Interpretation and limitations
    Consider chest radiography and urine assessment, with abdominal or pelvic imaging when the source remains unclear. Pregnancy should not prevent imaging needed for a serious maternal diagnosis. Arrange fetal assessment appropriate to gestation and circumstances, without allowing scanning or cardiotocography to delay maternal resuscitation.
    • when indicated. In high-risk patients, lactate 2–4 mmol/L warrants a bolus; lactate above 4 mmol/L or systolic pressure at or below 90 mmHg additionally prompts critical care review.
  • 5Monitor continuously where possible, or at least every 30 minutes according to setting. If there is inadequate response within one hour of intervention, request consultant attendance in person and reassess resuscitation, diagnosis and source control.
    • 02Uncertain early illnessReassess intermediate risk activelyThe patient has possible infection and moderate-to-high risk findings without an initial high-risk criterion.+
    1. 1Arrange clinician review within one hour and investigate according to the number of risk criteria, blood pressure and clinical picture; do not use a routine waiting-room interval.
    2. 2With two or more moderate-to-high risk criteria, or systolic pressure 91–100 mmHg even as a single criterion, obtain lactate and organ-function blood tests and arrange review of the patient and lactate within one hour. With two or more criteria plus lactate above 2 mmol/L or acute kidney injury, use the high-risk pathway.
    3. 3If a diagnosis remains unclear with reassuring lactate and no kidney injury, repeat structured assessment at least hourly and ensure a senior decision about antibiotics within three hours, following the relevant NG255 risk branch.
    4. 4AlternativeEscalationEscalate immediately if observations or symptoms worsen, and revisit alternative diagnoses when the clinical course does not fit infection.
    03Source and critical careControl infection and plan obstetric careSepsis is established, deterioration continues or a source requiring intervention is suspected.+
    1. 1Involve the relevant surgical, obstetric or interventional radiology team early; arrange drainage, debridement or removal of infected retained products as soon as the clinical situation permits.
    2. 2For pain suggesting necrotising infection, seek immediate surgical assessment and infection specialist input. Visible skin changes may lag behind deeper tissue injury.
    3. 3EscalationEscalate persistent shock, worsening gas exchange, reduced consciousness or major metabolic disturbance to critical care for organ support and appropriately monitored vasoactive treatment.
    4. 4Decide the timing and mode of birth with a senior obstetrician, the patient when possible and the wider team. Consider whether delivery contributes to source control or benefits maternal or fetal condition.
    5. 5Communicate maternal infection and antibiotic exposure to neonatal colleagues, reassess thromboprophylaxis and plan recovery support after the acute illness.
    Key medicines and prescribing safety4 treatments · regimens, roles and cautions+
    Restores circulating volume when sepsis causes impaired perfusion or hypotension.

    Intravenous crystalloid

    For patients aged 16 or over needing resuscitation, NG255 specifies 500 mL of crystalloid containing sodium 130–154 mmol/L over less than 15 minutes. Reassess immediately; a further bolus requires assessment of perfusion and pulmonary congestion.

    Avoid automatic repeated litres in patients with pre-eclampsia, cardiac disease or renal impairment. Persistent poor response after a second bolus requires consultant attendance, with early critical care involvement for shock rather than continuing fluids without review.

    Provides broad bacterial coverage when selected for the source and resistance pattern.

    Piperacillin with tazobactam

    An example component of broad empirical treatment for life-threatening sepsis is 4 g/0.5 g intravenously every 6 hours for particularly severe infection, infused over 30 minutes with this SmPC regimen. Usual less-severe indicated infections use an 8-hour interval; adjust ongoing dosing for renal impairment.

    This is not a universal maternal sepsis prescription. RCOG describes combination with clindamycin for life-threatening infection of uncertain sensitivity; severe beta-lactam allergy, suspected meningitis, MRSA or resistant Gram-negative organisms require a different or additional specialist-selected regimen.

    Adds relevant Gram-positive and anaerobic activity and suppresses bacterial toxin production.

    Clindamycin in severe combination treatment

    For severe pelvic or intra-abdominal infection, one supported adult regimen is 900 mg intravenously every 8 hours. Dilute 900 mg in 50–100 mL and infuse over at least 30 minutes; never give as a rapid intravenous bolus.

    Use as part of an infection-specific combination when indicated, including suspected invasive streptococcal or necrotising disease. It does not provide adequate Gram-negative coverage alone, resistance must be considered, and significant diarrhoea raises concern for Clostridioides difficile infection.

    5
    Before any discharge, establish that care outside hospital is suitable and give specific return instructions, an accessible contact route and an explanation of which results or reviews remain outstanding.
    Supports oxygen delivery while the infection and circulatory failure are treated.

    Oxygen and specialist vasopressor support

    In adults aged 18 or over, titrate oxygen to saturation 94–98%, or 88–92% when hypercapnic respiratory failure is a recognised risk. Persistent shock despite appropriate fluids needs critical care selection and titration of vasopressor therapy to measured haemodynamic response.

    A fixed oxygen flow or vasopressor dose cannot suit every patient. Assess airway protection, gas exchange, cardiac function and fluid responsiveness, and use a monitored setting with the appropriate infusion preparation and vascular-access plan.