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The Third Trimester Considerations

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Explores the complexities of late-pregnancy biometry, focusing on tracking growth trends and identifying issues like macrosomia or Intrauterine Growth Restriction (IUGR). This session provides clinical insights into using measurements to make informed decisions about delivery timing.

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1. Which biometric parameter is most commonly used to estimate fetal weight in the third trimester?
Crown-Rump Length (CRL) Biparietal Diameter (BPD) Abdominal Circumference (AC) Nuchal Translucency (NT)
2. Femur length (FL) in the third trimester is useful for assessing skeletal development and detecting growth proportionality.
True False
3. A 36-week ultrasound shows an estimated fetal weight (EFW) at the 10th percentile. What is the most likely diagnosis?
Macrosomia Intrauterine Growth Restriction (IUGR) Normal fetal growth Polyhydramnios
4. What is the primary purpose of growth curves and percentiles in the third trimester?
To diagnose genetic abnormalities To monitor fetal cardiac function To track fetal growth trends over time To predict maternal complications
5. Macrosomia is defined as a fetal weight greater than the 90th percentile or exceeding 4,000 grams.
True False
6. A fetus shows an AC measurement in the 95th percentile at 37 weeks. What is the most appropriate next step?
Suspect skeletal dysplasia and schedule genetic testing. Consider the possibility of macrosomia and assess maternal glucose levels. Repeat the measurement in the next trimester. Initiate corticosteroid therapy.
7. Which of the following clinical decisions can be informed by third-trimester biometry?
Timing of delivery Mode of delivery Management of IUGR or macrosomia All of the above
8. Accurate third-trimester measurements are less critical because fetal growth slows down compared to earlier trimesters.
True False
9. A fetus at 38 weeks has an EFW of 4,200 grams. What complication might this predict, and what should be considered?
Prediction: Preterm delivery; Consider immediate labor induction. Prediction: Macrosomia; Consider mode of delivery to reduce the risk of birth trauma. Prediction: IUGR; Consider early delivery. Prediction: Oligohydramnios; Consider amniotic fluid replacement therapy.
10. What is the most reliable method for identifying IUGR in the third trimester?
Measuring amniotic fluid index (AFI) Comparing biometric parameters to standardized growth charts Assessing maternal weight gain Estimating gestational age using CRL