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Organ weight standards for human fetuses.

T H Shepard1, M Shi, G W Fellingham

  • 1Department of Pediatrics, University of Washington, School of Medicine, Seattle 98195.

Pediatric Pathology
|January 1, 1988
PubMed
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This study established organ weight correlations in 558 human fetuses. Fetal body weight impacts organ development, with brain, heart, and liver showing linear growth relationships.

Area of Science:

  • Human developmental biology
  • Prenatal growth studies
  • Comparative anatomy

Background:

  • Understanding fetal organ development is crucial for assessing normal growth.
  • Previous studies on fetal organ weights have been limited in sample size.
  • Establishing normative data is essential for identifying growth abnormalities.

Purpose of the Study:

  • To establish correlations between fetal body weight and the weights of major organs.
  • To define normative growth curves for fetal organ weights.
  • To provide prediction intervals for organ weights in relation to body mass.

Main Methods:

  • Autopsy of 558 morphologically normal human embryos and fetuses (1.5–1500 g).
  • Exclusion of specimens from mothers with diabetes or hypertension.

Related Experiment Videos

  • Calculation of regression curves (quadratic equations) and 95% prediction intervals using weighted least squares analysis.

    • Main Results:

    • Linear relationships observed between body weight and the weights of brain, heart, and liver.
    • Nonlinear, gradually increasing ratios of thymus, spleen, and kidney to body weight.
    • Nonlinear, gradually decreasing ratios of lung and adrenal weights to body weight.

    Conclusions:

    • Detailed organ weight-to-body weight relationships were established for human fetuses.
    • The findings provide a valuable reference for prenatal growth assessment.
    • Results align with and expand upon previous smaller-scale studies.