When should you see a yolk sac

The discriminatory level for a yolk sac with transabdominal ultrasound was a mean gestation sac diameter (MSD) of 20 mm.9 Early TVS described a discriminatory level for the yolk sac of 8 mm.10 More recently Rowling et al.11 found that with 5 MHz transducers the yolk sac is definitively seen by a MSD of 13 mm but with newer 5-9 MHz transducers a yolk sac was definitively seen by the time the MSD was 5 mm. The presence of a larger sac with no evidence of yolk sac formation contained within it is a definitive sign of a non-viable pregnancy (Figure 4.4) In addition an abnormal or hydropic yolk sac is a non-specific sign or 'soft marker' of early pregnancy failure (Figures 4.5 and 4.6).

Figure 4.5 A highly magnified view of a gestational sac in a woman at 6+4 weeks by her LMP. This scan shows a small sac with a large hydropic (8.5 mm) yolk sac. This picture is compatible with intrauterine pregnancy failure.

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  • morgana
    When should yolk sac be seen?
    8 years ago
    Can you see yolk sac with ectopic pregnancy?
    8 years ago
  • raine
    When should i see the yolk sac on a scan?
    8 years ago
  • christopher black
    Can you see a yolk gestational sac with ectopic pregnancy?
    6 years ago
  • Eerik
    Can u see a sac articles on ectopic pregnancy?
    6 years ago
  • Cora Cocci
    When can you see yolk sack?
    6 years ago
  • Costantino Bellucci
    When is the time you see yolk sac on ultrasound?
    3 years ago
  • kerry mcnabb
    Can you see an egg yolk in an eptopic pregnancy?
    3 years ago
  • Kasey
    When is the latest you should see yolk sac?
    11 months ago

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