1st Trimester Normal MeasurementsThis is a featured page


First Trimester

  • Mean sac diameter (MSD) is the preferred method for measuring gestational sac size
  • The relationship between MSD and human chorionic gonadotropin should be used to aid assessment of the uterus and endometrial cavity in early pregnancy
  • CRL should be used for gestational age assessment once a fetal pole us detected
  • Discriminatory values for pregnancy viability in the 1st trimester:
    • Fetal pole must be seen when MSD ≥ 18 mm (TV) or ≥ 25 mm (TA)
    • Fetal heart activity must be seen when CRL ≥ 5 mm on TV or >9mm on TA

TABLES TO BE ADDED


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AndyC
AndyC 		Latest page update: made by AndyC , Mar 12 2009, 7:03 AM EDT (about this update About This Update AndyC Edited by AndyC

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