O45.013 Premature separation of placenta with afibrinogenemia, third trimester

Name of the Condition

• Premature Separation of Placenta with Afibrinogenemia, Third Trimester (O45.013)

Summary

Premature separation of placenta with afibrinogenemia, third trimester, is a pregnancy complication where the placenta detaches from the uterine wall before delivery, accompanied by a severe deficiency of fibrinogen. This condition can lead to significant maternal and fetal risks due to impaired blood clotting, hemorrhage, and reduced placental function, particularly in the third trimester.

Causes

The exact cause is often unclear, but it may result from trauma, hypertension, or uterine abnormalities. The afibrinogenemia typically arises from the release of placental tissue into the maternal circulation, triggering abnormal clotting processes and depleting fibrinogen levels.

Risk Factors

• Hypertensive disorders of pregnancy (e.g., preeclampsia).
• Trauma to the abdomen.
• Uterine abnormalities or prior uterine surgery.
• Advanced maternal age.
• Smoking or substance use during pregnancy.
• History of placental abruption.

Symptoms

• Sudden, severe abdominal pain.
• Vaginal bleeding (may be absent in some cases).
• Uterine tenderness or rigidity.
• Fetal distress (e.g., decreased movement, abnormal heart rate).
• Signs of shock (e.g., dizziness, rapid pulse).

Diagnosis

Diagnosis is based on clinical presentation, ultrasound imaging to assess placental separation, and laboratory tests to evaluate coagulation status (e.g., fibrinogen levels, platelet count). The third-trimester timing is confirmed by gestational age assessment.

Treatment Options

Treatment focuses on stabilizing the mother and fetus, which may include blood transfusions, fibrinogen replacement, and monitoring for complications. Delivery is often necessary if the fetus is viable, with timing dependent on maternal and fetal status.

Prognosis and Follow-Up

Prognosis depends on the severity of placental separation, fibrinogen levels, and fetal gestational age. Close monitoring for hemorrhage, coagulopathy, and fetal well-being is essential. Postpartum follow-up assesses recovery and future pregnancy risks.

Complications

• Severe maternal hemorrhage.
• Disseminated intravascular coagulation (DIC).
• Fetal growth restriction or death.
• Preterm birth.
• Maternal or fetal anemia.

Lifestyle & Prevention

• Manage chronic conditions like hypertension.
• Avoid abdominal trauma.
• Quit smoking or substance use.
• Attend regular prenatal care for early detection of risk factors.

When to Seek Professional Help

Seek immediate care for sudden abdominal pain, vaginal bleeding, or fetal movement changes during the third trimester. Prompt evaluation is critical to address potential placental abruption and coagulation issues.

Tips for Medical Coders

Document the third-trimester timing and afibrinogenemia to support O45.013. Include clinical details (e.g., fibrinogen levels, ultrasound findings) and gestational age to confirm specificity. Ensure differentiation from other placental separation codes without coagulation defects.