Retained Products of Conception
Pregnancy tissue remaining in the uterus after a loss or birth
Quick Facts
- Type: Pregnancy-related condition
- Key feature: Tissue left in the uterus
- Common signs: Prolonged bleeding, cramping, sometimes fever
- Seek urgent care: Heavy bleeding, fever, severe pain
Overview
Retained products of conception (RPOC) refers to pregnancy tissue — such as placental or fetal tissue — that stays inside the uterus after a miscarriage, childbirth, or pregnancy termination. Normally the uterus expels all of this tissue and then contracts to close off blood vessels and stop bleeding. When some tissue remains, it can prevent the uterus from contracting fully, leading to ongoing bleeding and a risk of infection.
RPOC is closely related to an incomplete abortion after an early loss and to retained placenta after delivery. It is a common and treatable condition, but because of the risk of heavy bleeding or infection, it needs medical evaluation. Treatment removes the retained tissue and allows the uterus to heal.
The amount of retained tissue can vary from a small fragment to a larger portion of the placenta or pregnancy. Small amounts may pass on their own, while larger amounts are more likely to cause heavy bleeding or to need active treatment. Because symptoms can begin days or even weeks after the pregnancy ends, it is important to be aware of the warning signs during recovery and to attend any recommended follow-up.
Symptoms
Symptoms often appear in the days or weeks after a pregnancy loss, birth, or termination.
- Prolonged or heavier-than-expected vaginal bleeding
- Passing tissue or large clots
- Cramping or persistent lower abdominal pain
- Bleeding that does not gradually settle
- Fever or foul-smelling discharge if infection develops
Warning signs needing urgent care include very heavy bleeding, severe pain, fever, foul-smelling discharge, or feeling faint or lightheaded, which may indicate significant blood loss or infection.
Causes
RPOC occurs when the uterus does not completely expel all pregnancy tissue. This can happen after:
- Miscarriage: Especially an early loss where some tissue remains.
- Childbirth: When a fragment of placenta or membranes stays attached.
- Pregnancy termination: If some tissue is not fully removed.
Factors such as how firmly tissue is attached and how well the uterus contracts can influence whether tissue is retained.
Risk Factors
- An earlier or second-trimester pregnancy loss
- Abnormal attachment of the placenta
- Previous uterine surgery or scarring
- Complicated or rapid delivery
- An incomplete miscarriage or termination
Diagnosis
Diagnosis is based on symptoms and imaging.
- History and examination: Reviewing recent pregnancy events and assessing bleeding and the uterus.
- Ultrasound: The main test, which can show tissue remaining within the uterus.
- Blood tests: Including pregnancy hormone levels, blood count, and signs of infection if suspected.
Treatment
Treatment aims to remove the retained tissue and control bleeding, with options based on the situation.
- Expectant management: Allowing small amounts of tissue to pass naturally when bleeding is light and there is no infection.
- Medication: Medicines that help the uterus contract and expel the remaining tissue.
- Surgical removal: A minor procedure to clear the tissue from the uterus, often used for heavier bleeding, larger amounts of tissue, or infection.
- Treating infection: Antibiotics if infection is present.
Most people recover well after the tissue is removed, and a clinician will advise on follow-up and recovery. After treatment, bleeding should gradually lessen over the following days. A repeat ultrasound or check of pregnancy hormone levels is sometimes used to confirm that the uterus has fully emptied. Pregnancy loss can be emotionally as well as physically difficult, and support from a clinician, counselor, or support group is an important part of recovery.
Prevention and Follow-Up
- RPOC cannot always be prevented, but careful follow-up after a loss, birth, or termination helps detect it early
- Attending postpartum or post-loss check-ups allows monitoring of bleeding and recovery
- Reporting prolonged or heavy bleeding promptly leads to earlier diagnosis
- Seeking care for fever or foul discharge helps prevent serious infection
When to See a Doctor
See a doctor for prolonged or heavy bleeding, ongoing cramping, or passing tissue after a pregnancy loss, birth, or termination. Seek emergency care or call emergency services immediately if you have:
- Very heavy bleeding, such as soaking a pad or more each hour
- Severe abdominal or pelvic pain
- Fever, chills, or foul-smelling discharge
- Feeling faint, dizzy, very weak, or short of breath
These can signal dangerous bleeding or infection that needs urgent treatment.
Frequently Asked Questions
What are retained products of conception?
They are pregnancy tissue, such as placental or fetal tissue, that remains in the uterus after a miscarriage, delivery, or termination. When tissue is left behind, the uterus cannot contract fully, which can cause prolonged bleeding and a risk of infection, so medical evaluation is needed.
How are retained products of conception treated?
Options include allowing small amounts of tissue to pass on their own when bleeding is light, medication to help the uterus expel the tissue, or a minor procedure to remove it. Antibiotics are added if there is infection. The choice depends on the bleeding, amount of tissue, and the person's situation.
What symptoms suggest retained pregnancy tissue?
Common signs include prolonged or heavier-than-expected bleeding, passing tissue or clots, and persistent cramping after a loss, birth, or termination. Fever or foul-smelling discharge suggests infection. An ultrasound is the main test used to confirm tissue remaining in the uterus.
When is retained tissue an emergency?
Seek emergency care for very heavy bleeding (soaking a pad or more each hour), severe pain, fever, chills, foul-smelling discharge, or feeling faint or short of breath. These can indicate dangerous blood loss or infection and need immediate treatment.
References
- MedlinePlus, U.S. National Library of Medicine. Miscarriage.
- American College of Obstetricians and Gynecologists (ACOG). Early pregnancy loss.
- Mayo Clinic. Retained placenta and postpartum bleeding.
- World Health Organization (WHO). Postpartum care and complications.