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Twin and singleton growth patterns compared using US.

K Grumbach, B G Coleman, P H Arger

    Radiology
    |January 1, 1986
    PubMed
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    Twin fetal growth differs from singletons, with biparietal diameter (BPD) and abdominal circumference (AC) showing reduced growth after 31-33 weeks. Femur length (FFL) growth remains similar. New twin growth charts are proposed.

    Area of Science:

    • Maternal-fetal medicine
    • Prenatal diagnostics
    • Fetal development research

    Background:

    • Sonography is standard for singleton fetal growth assessment.
    • Twin gestations require specific growth evaluation due to unique developmental patterns.

    Purpose of the Study:

    • To compare fetal growth parameters in twin pregnancies versus singletons.
    • To identify deviations in biparietal diameter (BPD), femur length (FFL), and abdominal circumference (AC) in twins.
    • To propose updated growth charts for twin pregnancies.

    Main Methods:

    • Statistical analysis of sonographic measurements from 103 twin pregnancies.
    • Comparison of twin BPD, FFL, and AC growth patterns against singleton reference data.

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    Main Results:

    • Twin biparietal diameter (BPD) growth decreased relative to singletons after 31-32 weeks gestation.
    • Twin abdominal circumference (AC) growth rate declined compared to singletons after 32-33 weeks gestation.
    • Twin fetal femur length (FFL) growth pattern showed no significant deviation from singletons.

    Conclusions:

    • Significant differences exist in BPD and AC growth patterns between twins and singletons.
    • Existing singleton growth charts may not accurately reflect twin development.
    • Development of specific growth charts for twin BPD and AC is recommended.