Placenta Accreta: Understanding Types, Risk Factors, and Care
Updated: 54 minutes ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
Placenta accreta is a serious pregnancy complication where the placenta attaches too deeply to the uterine wall, making it difficult to separate after birth. While often asymptomatic, it carries significant risks, including severe bleeding and preterm delivery. Early diagnosis via ultrasound is essential for planning a safe delivery, which typically involves a scheduled Cesarean section and, in many cases, a hysterectomy to prevent life-threatening complications.
Quick answer: Placenta accreta occurs when the placenta embeds too deeply into the wall of the uterus, potentially impacting surrounding organs. It is most common in individuals with a history of C-sections or uterine surgeries. Diagnosis is usually made through prenatal imaging, and management focuses on preventing severe hemorrhage during delivery. Treatment often requires a scheduled Cesarean section between 34 and 37 weeks, frequently followed by a hysterectomy to ensure the safety of the birth mother.
What Is Placenta Accreta?
Placenta accreta is a pregnancy complication characterized by the abnormal attachment of the placenta to the uterine wall. In a typical pregnancy, the placenta easily detaches from the uterus shortly after the baby is born. However, with placenta accreta, the placenta grows too deeply into the wall and does not separate naturally. This condition can lead to severe, life-threatening vaginal bleeding during or after delivery.
The Three Types of Attachment
Medical professionals categorize this condition into three types based on the depth of the placental attachment:
Placenta Accreta: The most common form, where the placenta firmly attaches to the uterine wall but does not penetrate the muscle.
Placenta Increta: The placenta is more deeply embedded and attaches firmly to the muscle of the uterus, accounting for about 15% of cases.
Placenta Percreta: The most severe type, occurring in about 5% of cases, where the placenta passes through the uterine wall and may impact other organs like the bladder or intestines.
Risk Factors and Causes
The primary cause of placenta accreta is related to abnormalities or scarring in the lining of the uterus. This scarring often results from previous surgical procedures, although the condition can occur in individuals without a surgical history.
Risk Factor | Impact on Prevalence |
Prior C-sections | Present in over 60% of cases; risk increases with each procedure. |
Placenta Previa | Higher risk when the placenta blocks the cervix, especially with prior C-sections. |
Uterine Surgeries | History of fibroid removal, curettage, or endometrial ablation increases risk. |
Pregnancy History | Risk is higher for those who have had more than one pregnancy or used IVF. |
Symptoms and Diagnosis
Placenta accreta is frequently asymptomatic, meaning most individuals do not experience noticeable signs during pregnancy. However, some may notice vaginal bleeding during the third trimester (weeks 28 to 40) or experience pelvic pain if the placenta presses against other internal organs.
Early diagnosis is critical and is typically achieved through a prenatal ultrasound. In some instances, a magnetic resonance imaging (MRI) scan may be used to determine exactly how deep the placenta has penetrated. In other cases, the condition is only discovered during delivery when the placenta fails to expel within the usual 30-minute window.
Management and Treatment
Once diagnosed, placenta accreta requires close monitoring by a specialized care team, which may include perinatologists and neonatologists. The goal of treatment is to minimize the risk of severe hemorrhage and ensure a safe delivery for both the mother and the baby.
Delivery Planning
Most healthcare providers recommend a scheduled Cesarean delivery between 34 and 37 weeks of gestation. Delivering early helps prevent the onset of labor and contractions, which can trigger significant bleeding. To support the baby's health, providers may administer corticosteroids to accelerate fetal lung development before the early delivery.
Surgical Options
Cesarean Hysterectomy: In many severe cases, removing the uterus (hysterectomy) at the time of the C-section is the safest way to prevent life-threatening bleeding.
Conservative Management: While providers may attempt to save the uterus for future pregnancies, leaving placental tissue behind carries risks of infection, blood clots, and severe hemorrhaging.
Outlook and Recovery
The outlook for individuals with placenta accreta is generally positive when the condition is diagnosed early and managed by a high-risk pregnancy team. However, complications such as massive blood loss or organ injury can occur. If a hysterectomy is performed, the individual will no longer be able to become pregnant in the future.
Are you experiencing unexpected bleeding or pelvic pain during your third trimester? Seek emergency medical care immediately to ensure a proper evaluation and timely intervention.
Frequently Asked Questions
What exactly is placenta accreta?
It is a condition where the placenta grows too deeply into the uterine wall and cannot easily detach after birth.
Is it a common condition?
It affects approximately 1 in 533 pregnancies, and the rate is rising due to increased C-section procedures.
What are the main symptoms?
It often has no symptoms, but some experience third-trimester bleeding or pelvic pain.
Who is at the highest risk?
Those who have had multiple C-sections or other uterine surgeries are at the greatest risk.
How is it diagnosed during pregnancy?
It is primarily diagnosed using a prenatal ultrasound, sometimes supplemented by an MRI.
Can it be prevented?
No, there is no known way to prevent the condition, but risks can be discussed based on your health history.
Does it harm the baby?
It doesn't directly harm the fetus, but it often leads to preterm birth, which carries its own set of risks.
Why is an early C-section necessary?
Delivering between 34-37 weeks prevents labor contractions that could cause dangerous bleeding.
Is a hysterectomy always required?
Not always, but it is often the safest option to prevent life-threatening hemorrhage.
What is placenta previa?
A condition where the placenta blocks the cervix; having both previa and a history of C-sections significantly increases accreta risk.
Can I have a vaginal delivery?
In most cases of placenta accreta, a scheduled C-section is required for safety.
What is the difference between increta and percreta?
Increta attaches to the uterine muscle, while percreta grows through the wall into other organs.
Will I need a blood transfusion?
Because of the risk of heavy bleeding, many patients require a transfusion during delivery.
Can I get pregnant again after accreta?
If your uterus is preserved, it may be possible, but the risk of recurrence is high. If a hysterectomy is performed, future pregnancy is not possible.
What is the survival rate?
The survival rate is generally very good when the condition is diagnosed and managed early by specialists.
References
Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or medication.
Comments