Post-Term Pregnancy

What Is Post-Term Pregnancy?

Pregnancy is generally accepted to last 40 weeks, and most babies are born within this time frame. However, in some pregnancies, birth may be delayed beyond 42 weeks. This condition is referred to as “post-term pregnancy” and carries certain risks for both the mother and the baby.

Post-term pregnancy is defined as a pregnancy that lasts 42 weeks or longer. While the normal duration of pregnancy is considered to be between 37 and 42 weeks, pregnancies that extend beyond 42 weeks are regarded as prolonged. Post-term pregnancy occurs in approximately 5 out of every 100 pregnancies and is more common in first-time pregnancies.

Causes of Post-Term Pregnancy

One of the most common causes of post-term pregnancy is incorrect calculation of gestational age. Uncertainty about the last menstrual period or factors such as late ovulation can lead to miscalculation of pregnancy weeks. As a result, a pregnancy that is actually within the normal timeframe may be mistakenly considered post-term. However, in truly post-term pregnancies, a clear cause may not always be identified.

Risks of Post-Term Pregnancy

Post-term pregnancy carries several risks for both the mother and the baby, including:

Placental Insufficiency: As pregnancy continues, the placenta begins to age and may no longer function efficiently. This can result in reduced oxygen and nutrient supply to the baby.

Decreased Amniotic Fluid: As gestational age advances, the amount of amniotic fluid may decrease. Low amniotic fluid can restrict the baby’s movements and increase the risk of umbilical cord compression.

Large Baby (Macrosomia): Babies who are not born on time may continue to grow in the womb and be born larger than average. This can lead to complications during delivery.

Meconium Aspiration: In post-term pregnancies, the baby may pass its first stool (meconium) while still in the womb and inhale it into the lungs. Meconium aspiration can cause serious respiratory problems.

Increased Cesarean Delivery Rates: The likelihood of cesarean delivery increases in post-term pregnancies, as the risk of complications during vaginal birth may be higher.

Symptoms and Diagnosis of Post-Term Pregnancy

Accurate calculation of gestational age is essential for diagnosing post-term pregnancy. Clearly remembering the last menstrual period and having early ultrasound examinations help determine pregnancy age more precisely. In cases of post-term pregnancy, your doctor may perform certain tests after the 40th week to closely monitor the baby’s health.

These tests may include:

NST (Non-Stress Test): Monitors the baby’s heart rate and movements in the uterus.

Biophysical Profile: Uses ultrasound to assess amniotic fluid volume, fetal movements, breathing, and muscle tone.

Management of Post-Term Pregnancy

In cases of post-term pregnancy, your doctor may consider initiating labor. Methods used to induce labor include:

Cervical Ripening: Medications such as prostaglandins may be used to soften and dilate the cervix.

Membrane Sweeping: During a vaginal examination, the membranes around the cervix may be gently separated by the doctor. This procedure often helps initiate labor.

Artificial Rupture of Membranes: During a vaginal examination, the membranes surrounding the baby may be ruptured to allow the amniotic fluid to drain, which can trigger labor contractions.

Administration of Oxytocin: Oxytocin given intravenously stimulates uterine contractions and accelerates the labor process.

Induction of Labor

(Induction)

These methods used to initiate labor are generally effective in cases of post-term pregnancy. However, every pregnancy is unique, and the decision to induce labor is made based on the evaluations performed by your doctor.

Post-term pregnancy is a condition that requires careful monitoring during the course of pregnancy. With accurate diagnosis and timely intervention, complications related to post-term pregnancy can largely be prevented. Regular prenatal check-ups, close monitoring of the baby’s health, and careful attention to symptoms are critical for a healthy delivery process. In cases of post-term pregnancy, following your doctor’s recommendations closely and undergoing the necessary tests will be the best approach for the health of both you and your baby.