quick ultrasound normals: early OB and post-void residuals

30 Nov

via a recent handy post from ALiEM (which includes a number of other ultrasound normals)

a couple quick reference notes for some things I’ve continually had to look up (so maybe you’ll remember what I often cannot):

EARLY OB Ultrasound:

  • gestational sac: seen by ~4-5 weeks
  • yolk sac: seen by ~5.5 weeks
  • cardiac activity: seen by ~6 weeks


normal post-void residual:fish-lure-2

  • < 100-150 mL
  • or roughly 1/3 of a 12oz can of soda


References: ALiEM post; volume reference; picture


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