Placenta Accreta Spectrum (PAS): What It Means and When to Seek Help
Placenta accreta spectrum (PAS) is a rare but potentially life-threatening pregnancy complication where the placenta attaches too deeply or abnormally to the uterus. PAS can lead to serious bleeding during childbirth, making early detection and regular prenatal care especially important.
Normally, the placenta separates easily from the uterine wall after delivery. In PAS, however, the placenta may grow into the muscle layer of the uterus or even into nearby organs, which increases health risks for both mother and baby. Most cases of PAS are discovered during routine ultrasound exams, as symptoms are often subtle or absent.
What is PAS? – Types and Definitions
Placenta accreta spectrum includes three main types:
- Placenta accreta: The placenta attaches to the uterine wall but does not invade deeply.
- Placenta increta: The placenta grows into the muscle layer of the uterus.
- Placenta percreta: The placenta penetrates through the uterine wall and may reach nearby organs, such as the bladder.
All forms of PAS carry a higher risk of severe bleeding during delivery.
How Does PAS Develop? – Biological Background
PAS usually develops due to previous injury or scarring of the uterus. The most common risk factors include:
- Multiple cesarean sections
- Previous placental problems (such as placenta previa)
- Uterine surgery
- Damage to the uterine lining
Scarring or injury to the uterus can make normal placental attachment difficult, allowing the placenta to grow deeper than usual.
What Are the Signs of PAS?
PAS is often silent until delivery. In some cases, you might notice:
- Recurrent bleeding during pregnancy
- Unusual findings on ultrasound (such as the placenta being close to a previous cesarean scar)
- Persistent or severe lower abdominal pain
Most PAS cases are diagnosed by ultrasound or MRI, not by symptoms alone.
How Is PAS Detected and Managed?
Imagine a pregnant woman with a history of cesarean section attending a prenatal ultrasound. If the doctor sees the placenta attached near a previous scar, further tests may be recommended. If PAS is confirmed, delivery is planned with a multidisciplinary team, often at a hospital and on a scheduled date.
The main goal of treatment is to minimize bleeding and keep the mother safe. In some cases, a hysterectomy (removal of the uterus) may be necessary, but every situation is carefully evaluated.
What Are the Risks of PAS?
The greatest danger with PAS is severe bleeding during childbirth, which can be life-threatening. Other risks include:
- Need for blood transfusion
- Increased risk of infection
- Longer hospital stay
- Possible removal of the uterus
Early diagnosis and expert care can greatly reduce the risk of complications.
When Should You See a Doctor? – Warning Signs
Contact your OB-GYN right away if you experience:
- Recurrent or heavy bleeding
- Unusual lower abdominal pain
- History of cesarean section or uterine surgery
- Abnormal findings on ultrasound
Regular prenatal checkups and screening help with early detection.
What Should You Do If PAS Is Suspected?
- Follow your doctor's advice closely
- Attend all recommended tests and appointments
- Be prepared for special delivery planning
- Ask questions if you feel uncertain
A multidisciplinary team (obstetrician, anesthesiologist, surgeon) will help ensure your safety during delivery.
Support and Reassurance During Pregnancy
A PAS diagnosis can feel overwhelming, but with modern medical care and experienced professionals, you can feel confident and supported. Regular prenatal visits, open communication, and access to reliable information will help you face any challenges with peace of mind.
For more trustworthy tips and guidance throughout your pregnancy, our free app offers additional support. Remember, you are not alone—reach out to your healthcare team with any questions or concerns!