What doctors look at in 1st Trimester Ultrasound
  • Uterus and adnexa for presence of gestational sac

  • Presence or absence of yolk sac and/or embryo

  • Crown-Rump length of embryo if possible

  • Presence of cardiac activity

  • Fetal number and chorionicity/amnionicity


    • Reasons to have a 1st Trimester Ultrasound
  • Estimate gestational age

  • Diagnose or evaluate multiple gestations

  • Confirm cardiac activity

  • Confirm presence of intrauterine pregnancy

  • Evaluate suspected ectopic pregnancy

  • Define cause of vaginal bleeding

  • Evaluate pelvic pain


    • What doctors look for in 2nd and 3rd Trimester Ultrasound
  • Fetal cardiac activity, number, and presentation

  • Qualitative or semi-quantitative estimate or amniotic fluid volume

  • Placenta location, appearance, and relationship to cervix

  • Gestational Age assessed using CRL, biparietal diameter, head circumference, femur length, and abdominal circumference

  • Fetal weight estimated using above measurements

  • Evaluation of maternal uterus and adnexal structures