What Is the McDonald’s Rule for Pregnancy? Explained

Learn how the McDonald’s rule uses fundal height to estimate pregnancy weeks between 20 and 36 weeks.

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What is the McDonald's rule for pregnancy? The McDonald's rule estimates gestational age by measuring the fundal height (the distance from the pubic bone to the top of the uterus) in centimeters. The measurement roughly equals the number of weeks of pregnancy from weeks 20 to 36.

FAQs & Answers

  1. How does the McDonald’s rule help estimate gestational age? The McDonald’s rule estimates gestational age by measuring the fundal height from the pubic bone to the top of the uterus in centimeters, which corresponds to the number of pregnancy weeks between 20 and 36 weeks.
  2. When is the McDonald’s rule most accurate during pregnancy? The McDonald’s rule is most accurate from 20 to 36 weeks of pregnancy when fundal height measurement closely matches gestational age in weeks.
  3. What is fundal height and how is it measured? Fundal height is the distance from the top of the pubic bone to the top of the uterus, measured in centimeters to help estimate fetal growth and gestational age.
  4. Can the McDonald’s rule be used after 36 weeks of pregnancy? The McDonald’s rule becomes less accurate after 36 weeks due to factors like fetal positioning and growth variations affecting fundal height measurements.

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