Recommendation I-2: Encourage the use of ultrasound early in pregnancy to establish gestational age. Because it is recognized that more precise measures of gestational age are needed to move the field forward, professional societies should encourage the use of ultrasound early in pregnancy (less than 20 weeks of gestation) to establish gestational age and should establish standards of practice and recommendations for the training of personnel to improve the reliability and the quality of ultrasound data.
Recommendation I-3: Develop indicators of maturational age. Funding agencies should support and investigators should develop reliable and precise perinatal (prenatal and postnatal) standards as indicators of maturational age.
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Section I Recommendations ."
Preterm Birth: Causes, Consequences, and Prevention . Washington, DC: The National Academies Press,
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