Reference values for second trimester fetal and neonatal organ weights and measurements

Pediatr Dev Pathol. 2003 Mar-Apr;6(2):160-7. doi: 10.1007/s10024-002-1117-3. Epub 2003 Jan 29.


To establish accurate reference ranges for the entire second trimester, we documented organ weights, body weight, and linear measurements for 597 fetuses and neonates with gestational ages ranging from 12 to 26 wk. We determined the mean and standard deviation for weights and measurements at each week of gestation using the StatView trade mark SE + Graphics statistical program. The analyses revealed a linear correlation between the gestational age and, respectively, the toe-heel length, crown-rump length, and crown-heel length. Body and organ weights increase at varying rates throughout the second trimester. The data correlate well with weights and measurements previously published for the latter half of the second trimester, and extend these reference ranges to encompass the entire second trimester.

Publication types

  • Comparative Study

MeSH terms

  • Crown-Rump Length*
  • Female
  • Fetus
  • Gestational Age
  • Humans
  • Infant, Newborn
  • Organ Size*
  • Pregnancy
  • Pregnancy Trimester, Second
  • Reference Values
  • Retrospective Studies