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← Obstetrics and gynaecology indexChapter sections
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.

Placental abruption

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

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Painful bleeding or concealed obstetric haemorrhage

A tense tender uterus, shock or fetal deterioration may reflect major placental separation even when little vaginal blood is visible.

Action: Activate urgent obstetric and anaesthetic assessment, begin haemorrhage resuscitation, obtain coagulation testing including fibrinogen and coordinate expedited birth when either patient is compromised.

Overview

Identify placental separation despite concealed blood loss, resuscitate maternal haemorrhage promptly, and coordinate delivery according to maternal stability and fetal condition.

Placental abruption disrupts the exchange surface while simultaneously creating a maternal haemorrhage. Separation can involve a limited edge or a large portion of the placental bed. Blood may escape through the cervix, remain trapped behind the placenta, or do both. These patterns explain why external bleeding poorly estimates severity. A painful, rigid uterus and shock with scant vaginal loss is particularly dangerous, but absence of rigidity does not establish safety. The key early decisions are whether circulation is threatened, whether the fetus is alive and compromised, and whether birth is already imminent.

Associated conditions include previous abruption, hypertension or pre-eclampsia, fetal growth restriction, smoking, stimulant drug exposure and abdominal trauma. Sudden uterine decompression and ruptured membranes also feature in the clinical history. Most individual risk factors are neither necessary nor sufficient to diagnose an acute event. Ask about trauma in private where appropriate because intimate-partner violence may not be volunteered in front of a companion. Do not allow a previously uncomplicated pregnancy to lower vigilance when new symptoms strongly suggest separation.

Aetiology

01

Placental vascular disease

Hypertensive disorders and placental dysfunction can predispose the decidual circulation to disruption, with previous abruption marking an increased risk in later pregnancies.

02

Mechanical or toxic triggers

Abdominal trauma, sudden decompression and stimulant exposure can contribute to separation; smoking and membrane rupture are additional recognised associations with the condition.

Pathophysiology

  1. 1
    Retroplacental bleeding

    Haemorrhage at the maternal placental interface creates a clot that can extend the area of separation and remain concealed behind the placenta.

  2. 2
    Loss of exchange surface

    Separation reduces functional placental perfusion, while maternal hypovolaemia further limits fetal oxygen delivery and can rapidly produce fetal hypoxia or death.

  3. 3
    Coagulation consumption

    Extensive placental injury activates coagulation and consumes circulating haemostatic components, creating a cycle in which bleeding worsens as clotting capacity falls.

Clinical features and red flags

Painful uterine change

Continuous abdominal or back pain, focal tenderness and a persistently firm uterus may be more informative than the amount of vaginal blood.

Unexpected contraction pattern

Frequent contractions or apparent preterm labour can be the first manifestation of a developing abruption rather than an isolated labour disorder.

Circulatory mismatch

Pallor, tachycardia, reduced urine output or hypotension with little external loss should raise suspicion of concealed haemorrhage.

Fetal deterioration

Reduced movement, a pathological heart-rate pattern or fetal death can result from loss of placental exchange and maternal hypoperfusion.

Red flags requiring action

  • Severe persistent abdominal pain with a tense uterus or worsening maternal physiology requires emergency assessment for concealed abruption.
  • An abnormal fetal trace, absent fetal movements or suspected fetal death can accompany extensive separation and should trigger immediate senior review.

Investigations

  1. 01
    Immediate maternal and abdominal examinationFirst step
    Why
    Identify shock, uterine tenderness, tone and other causes of acute abdominal pain.
    Interpretation and limitations
    Trend the findings during resuscitation because progression may be faster than laboratory reporting; normal blood pressure alone does not exclude compensated shock.
  2. 02
    Fetal monitoring or viability ultrasound
    Why
    Determine fetal condition and how urgently delivery may be required.
    Interpretation and limitations
    Use continuous monitoring when appropriate and when the result can alter intervention; confirm suspected death with real-time ultrasound by a suitably trained practitioner.
  3. 03
    Full blood count and urgent crossmatch
    Why
    Prepare transfusion support and establish platelets and an initial haemoglobin measurement.
    Interpretation and limitations
    An early haemoglobin can underestimate the eventual fall; platelet depletion may signal severe consumption and should be interpreted with clinical bleeding.
  4. 04
    Coagulation screen including fibrinogen
    Why
    Detect and follow consumptive coagulopathy during major placental haemorrhage.
    Interpretation and limitations
    Repeat with continuing loss and direct component replacement with haematology or major-haemorrhage guidance rather than relying on the first specimen.

Differential diagnosis

01

Placenta praevia

Low placental implantation commonly causes painless bleeding; ultrasound localisation is needed before digital examination because symptoms alone cannot safely distinguish every case.

02

Uterine rupture

Severe pain and fetal compromise, particularly with a uterine scar or labour, may reflect disruption of the uterine wall and require immediate surgical assessment.

03

Non-obstetric abdominal disease

Appendicitis, renal colic and other abdominal pathology may cause pain or contractions, but maternal and fetal assessment must still actively exclude an obstetric emergency.

Management

01Immediate responseTreat suspected major abruptionFirst stepPainful bleeding, concealed loss or maternal or fetal compromise suggests substantial separation.+
  1. 1Summon consultant obstetrics, anaesthesia, senior midwifery and neonatal staff; establish intravenous access and request the obstetric major-haemorrhage pathway when indicated.
  2. 2Restore circulation with appropriate warmed resuscitation and blood products, measure ongoing loss, catheterise when necessary and track urine output and perfusion.
  3. 3Make an urgent delivery decision from maternal physiology, fetal assessment and stage of labour; do not postpone treatment for a negative or unavailable ultrasound.
02DeliveryChoose the route that protects maternal and fetal survivalContinuing pregnancy is unsafe or labour has become established after suspected abruption.+
  1. 1

Complications

01

Disseminated intravascular coagulation

Consumption of fibrinogen, platelets and clotting factors can cause diffuse bleeding requiring urgent component replacement and treatment of the underlying placental emergency.

02

Maternal organ injury

Severe haemorrhagic shock may impair renal, hepatic and cerebral perfusion, with critical-care requirements determined by the duration and depth of circulatory failure.

03

Fetal hypoxia and prematurity

Loss of placental function can cause neurological injury or fetal death, while necessary early delivery adds the complications associated with immature neonatal organs.

Monitoring and follow-up

  • During acute care record frequent maternal observations, uterine findings, fluid balance and ongoing loss, with repeated senior review when the clinical picture changes.
  • Repeat platelets, coagulation studies and fibrinogen during major haemorrhage until bleeding and consumption are controlled and laboratory recovery is established.
  • If pregnancy continues, arrange consultant-led surveillance of growth and wellbeing and review the planned gestation of birth according to the evolving placental risk.
  • After delivery check renal recovery, anaemia, blood pressure, bleeding and VTE risk, balancing thromboprophylaxis against haemostasis.
  • Offer an explanation of confirmed and uncertain findings, including placental examination results and a future-pregnancy plan after a severe or recurrent event.

Special situations

Negative imaging is not exclusion

Acute blood can resemble placental tissue on ultrasound, and a small or concealed separation may be missed despite clinically important consequences.

Fetal death increases maternal concern

The absence of a fetal rescue indication does not make care less urgent; severe separation may already have produced haemorrhage and consumptive coagulopathy.

A bruised uterus can still contract

Blood may infiltrate the uterine muscle in severe abruption, but this appearance alone does not mandate hysterectomy if haemorrhage can be controlled.

Trauma history requires privacy

Sensitive questions about injury or coercion can uncover a preventable ongoing risk and should be paired with practical safeguarding support.

Common pitfalls

  1. 01

    Excluding abruption because the ultrasound report describes no retroplacental clot.

  2. 02

    Equating minimal vaginal bleeding with a small total haemorrhage despite shock or a tense uterus.

  3. 03

    Using tocolysis to suppress contractions caused by significant placental separation and thereby delaying required delivery.

  4. 04

    Performing caesarean birth automatically after fetal death without assessing maternal coagulation, stability and the feasibility of vaginal birth.

Practice

Two practice questions

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Question 1 of 2
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Obstetrics and gynaecologyOriginal SBA

Interpreting a reassuring ultrasound

At 33 weeks a patient develops severe continuous abdominal pain, a tender tense uterus and a pathological fetal trace. Vaginal bleeding is scant and ultrasound reports no retroplacental haematoma. What should happen next?

Choose one answer, then submit
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Sources and review status4 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 antepartum haemorrhage clinical guideline
  • RCOG 2026 placenta praevia and accreta spectrum guideline
  • BSH anti-D prophylaxis after sensitising events
  • RCOG late intrauterine fetal death and stillbirth

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 reviewJurisdictionUnited Kingdom
Tissue injury and clot formation can consume platelets and clotting factors, making coagulopathy a cause of worsening haemorrhage rather than merely its consequence. Fibrinogen can fall early in severe obstetric bleeding. Obtain serial results and involve haematology when loss is major or laboratory abnormalities develop; a single initial normal coagulation result cannot predict the subsequent course. Correct hypothermia, acidosis and hypocalcaemia during major transfusion through the multidisciplinary protocol. Definitive control may require delivery while these measures continue.

The birth decision depends on the complete clinical situation. Maternal instability or sustained fetal compromise demands urgent intervention. When a live fetus is compromised and vaginal birth is not imminent, caesarean birth is generally the quickest route. After confirmed fetal death, vaginal birth is often preferable if maternal status permits because surgery adds bleeding risk without fetal benefit. Significant maternal deterioration can still require operative intervention. Limited suspected separation with settled symptoms and reassuring assessments may be managed expectantly under senior obstetric care, with explicit surveillance and escalation thresholds.

Key points

  • Abruption is premature separation of a normally situated placenta before birth, with revealed, concealed or mixed bleeding.
  • The diagnosis is clinical; a normal ultrasound cannot reliably exclude placental abruption.
  • Maternal shock may be disproportionate to the visible loss because blood can collect behind the placenta.
  • Pain, uterine tenderness, frequent contractions and sustained tone are concerning, but milder cases may lack the complete classical picture.
  • Send full blood count, group and crossmatch, coagulation screen and fibrinogen when significant abruption is suspected.
  • Resuscitation and delivery planning proceed together; do not wait for imaging confirmation in an unstable patient.
  • A viable fetus with sustained compromise usually requires urgent caesarean birth unless vaginal birth is imminent; fetal death changes the balance toward maternal safety and often vaginal birth.
05
Placental ultrasound and indicated biochemistry
Why
Assess placental location, possible haematoma, growth and maternal organ effects.
Interpretation and limitations
Ultrasound may reveal a clot but lacks sensitivity to exclude abruption; renal function, liver tests and lactate help assess shock or associated hypertensive disease.
For persistent fetal compromise with a viable fetus, organise emergency caesarean birth unless an immediate vaginal birth is achievable.
  • 2When fetal death is confirmed, discuss induction or expedited vaginal birth if the mother is sufficiently stable, while correcting bleeding and coagulation abnormalities.
  • 3EscalationPrepare active third-stage management and escalation for postpartum haemorrhage, with anaesthetic and transfusion support appropriate to the evolving risk.
    • 03Conservative careObserve a limited settled episode safelySymptoms have settled and senior review finds maternal and fetal assessments reassuring.+
    1. 1Arrange observation and repeat clinical assessment, explicitly documenting the working diagnosis and what would prompt admission, further monitoring or birth.
    2. 2Assess fetal growth and plan surveillance when abruption or unexplained antepartum bleeding suggests placental dysfunction.
    3. 3Address hypertension, smoking and substance exposure support, and provide immediate return instructions for recurrent pain, bleeding, reduced movement or fluid loss.
    Key medicines and prescribing safety2 treatments · regimens, roles and cautions+
    Protects against maternal RhD alloimmunisation from fetal red-cell exposure.

    Event-related anti-D immunoglobulin

    After an abruption-associated bleed beyond 20 weeks in a non-sensitised RhD-negative patient, give a minimum 500 IU within 72 hours by the preparation's authorised route, then supplement according to laboratory fetomaternal-haemorrhage measurement.

    Neither a negative Kleihauer test nor previous routine antenatal anti-D cancels the event-related indication; coordinate repeat testing and dosing if bleeding continues.

    Replaces circulating volume, oxygen-carrying capacity and consumed haemostatic components in severe abruption.

    Haemorrhage blood-component replacement

    Use the activated obstetric major-haemorrhage protocol for warmed red cells and coagulation components, titrating to clinical loss, fibrinogen, platelet count and coagulation or viscoelastic results; this requires immediate transfusion-team prescription rather than a fixed outpatient dose.

    Monitor temperature, ionised calcium, acid-base status and fluid balance; excessive crystalloid without timely blood replacement can worsen dilution and tissue hypoperfusion.