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Keywords:

  • Crown-rump;
  • Gestational Age;
  • Biometry;
  • Early Pregnancy;
  • Ultrasound

Abstract

Three hundred ninety fetal crown-rump measurements by ultrasound echography were performed in order to correlate the crown-rump length with gestational age between the sixth and fourteenth weeks of gestation. A blind trial in 58 patients showed a good correlation of ultrasonically determined age and menstrual age. A graph of normal values was designed and is currently being used in routine work.