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Related Experiment Videos

Relationship between Grade III placentas and biparietal diameter determinations.

S S Ashton, M P Russo, N V Simon

    Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine
    |March 1, 1983
    PubMed
    Summary

    Ultrasound assessment revealed Grade III placentas in 12% of women. Early Grade III placentas do not guarantee fetal lung maturity, necessitating alternative assessment methods.

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    Area of Science:

    • Obstetrics and Gynecology
    • Fetal Medicine
    • Radiology

    Background:

    • Placental grading via ultrasound is a common method to assess fetal development.
    • Grade III placentas are typically associated with later stages of pregnancy.
    • Previous assumptions linked Grade III placentas directly to fetal lung maturity.

    Purpose of the Study:

    • To evaluate the occurrence of Grade III placentas in early gestation.
    • To determine if Grade III placentas accurately predict fetal lung maturity.
    • To investigate alternative methods for assessing fetal pulmonary status.

    Main Methods:

    • Ultrasound evaluation of 1,082 pregnant women after 20 weeks of gestation.
    • Assessment of placental grading and biparietal diameter measurements.

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  • Correlation of placental grade with gestational age and potential fetal lung maturity.

    • Main Results:

    • Grade III placentas were identified in 133 (12%) women.
    • In 11 women without known complications, Grade III placentas appeared between 30-33 weeks.
    • Gestational age determination using the Sabbagha method was accurate (1-3 days).

    Conclusions:

    • A Grade III placenta identified before term does not reliably indicate fetal lung maturity.
    • Reliance on placental grading alone for fetal lung maturity assessment is insufficient.
    • Alternative criteria are recommended for evaluating fetal pulmonary status.