Nursing care
Uterine atony vs retained placenta for the NCLEX
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Uterine atony is inadequate uterine contraction after birth, often associated with a boggy fundus and bleeding. Retained placenta means the placenta has not delivered, while retained fragments can remain after delivery. Tissue retention can contribute to atony, so both may coexist. Assess bleeding, uterine tone, placental status, and maternal condition together.
Distinguish poor contraction from tissue remaining inside
Uterine atony concerns the uterus failing to contract effectively after birth. Retained placenta concerns placental delivery: the placenta has not been expelled as expected. Retained placental fragments are tissue left behind after an apparently completed delivery. These categories answer different questions, so they should not be treated as mutually exclusive causes of postpartum haemorrhage.
Use the four Ts framework to keep the comparison organised: tone, tissue, trauma, and thrombin. Atony belongs under tone, retained placental tissue under tissue, genital tract injury under trauma, and clotting abnormalities under thrombin. The framework guides a search for causes while the emergency response proceeds. More than one category can contribute to the same episode of bleeding.
Read fundal findings alongside placental information
A soft, poorly contracted or boggy uterus with excessive bleeding supports concern for atony. Assess the fundus and response to initial treatment while colleagues address the rest of the haemorrhage response. A temporary improvement in firmness is useful information, but it does not by itself establish that blood loss has stopped or that the underlying cause has resolved.
Placental status supplies a separate line of evidence. An undelivered placenta, an incomplete-looking placenta after delivery, or concern about remaining tissue needs obstetric evaluation. Persistent bleeding with a firm uterus should also prompt consideration of trauma and other causes. A firm fundus does not justify dismissing blood loss, and a boggy fundus does not exclude retained tissue.
Respond to haemorrhage while investigating its source
Call for help and activate the postpartum haemorrhage pathway when the findings warrant it. Assess ongoing blood loss and maternal condition, including pulse, blood pressure, consciousness, and response to interventions. Support intravenous access, prescribed fluids and medicines, ordered investigations, and preparation for further treatment. Documentation should record changes over time so the team can see whether the response is working.
When atony is suspected, uterine massage and prescribed uterotonics form part of the immediate response, with attention to bladder emptying when appropriate. These actions occur within a coordinated bundle, not as a prolonged trial before anyone calls for assistance. The team continues to examine the source of bleeding and escalates when initial measures fail or the patient deteriorates.
Understand why retained placenta changes the plan
Retained placenta requires a plan for placental delivery or removal by the obstetric team. The timing depends on the third-stage approach, elapsed time, bleeding, and maternal condition. Active haemorrhage takes priority over waiting for a routine time threshold. Prepare for the indicated procedure and analgesia or anaesthesia; manual removal is not an independent bedside nursing manoeuvre.
Uterotonics used for active postpartum haemorrhage should not be confused with routine drug treatment of retained placenta when haemorrhage is absent. WHO guidance distinguishes those situations. Continuing medication alone can delay the treatment needed for retained tissue. After the placenta is delivered or tissue is removed, reassess uterine tone and blood loss because atony or another bleeding source can still persist.
Compare plausible answers in an original practice scenario
Imagine a patient immediately after vaginal birth with brisk bleeding and a boggy uterus. The placenta has been delivered, but its inspection is not yet complete. Options include initiating the haemorrhage response with uterine assessment and massage, assuming retained tissue is impossible, waiting for a haemoglobin result, or documenting normal lochia. The first option best addresses the immediate findings and risk.
The likely contribution is atony, but the scenario deliberately leaves the completeness of the placenta unresolved. If bleeding persists despite improved tone, the team must reassess tissue, trauma, and clotting rather than repeat one explanation indefinitely. In a variation where the placenta remains undelivered and bleeding increases, prioritise haemorrhage management and preparation for obstetric treatment of the retained placenta together.
Sources and further reading
WHO: Consolidated postpartum haemorrhage recommendations. Four Ts, coordinated treatment and retained placenta management with or without haemorrhage.
NICE: Intrapartum care recommendations. Postpartum haemorrhage response, retained placenta and anaesthesia for manual removal.
RCOG: Heavy bleeding after birth. Postpartum bleeding, retained tissue and treatment pathways.
WHO technical consultation: Postpartum haemorrhage care bundles. Coordinated haemorrhage treatment and addressing placental retention.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our maternity and newborn practice questions are the closest set to what this page covers.
Common questions
Can retained placental tissue cause uterine atony?
Yes. Retained tissue can interfere with effective contraction, so tissue retention and atony may coexist. Assess placental completeness and the response to treatment rather than assuming only one cause.
Does a firm uterus exclude postpartum haemorrhage?
No. Trauma, retained tissue or a clotting problem may contribute to bleeding even when the fundus feels firm. Ongoing blood loss and maternal condition require continued assessment.
Should the nurse wait for a time threshold if bleeding is increasing?
No. Active haemorrhage or deterioration requires immediate escalation and treatment. Routine third-stage timing does not justify delaying the emergency response.