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Pregnancy / Fetus



IUGR: phenotypes

pure symmetrical IUGR
  • low profile IUGR
  • proportionate reduction of all fetal measurements
  • etiology:
    • intrisic alteration in growth potential
    • severe nutritional deprivation overwhelming protective brain-sparing mechanism occuring prior to 26 weeks and persisting until delivery

assymetrical IUGR
  • late flattening IUGR (75%)
  • disproportionate reduction of fetal measurements due to uteroplacental insufficiency with preferential shunting of blood to fetal brain
  • high HC (head circumference)/AC (abdominal circumference) and FL (femur length)/AC ratios

see also: intrauterine growth retardation (IUGR)

Yong H. Hahn, MD  -  2 February 1995
Last updated:  1 October 2013


Related CHORUS documents:
intrauterine growth retardation (IUGR)
IUGR: etiology
fetal doppler study
biophysical profile
meconium aspiration syndrome
multiple gestation


Copyright © 2013, Charles E. Kahn, Jr.