Twin Pregnanacy

Ultrasound scanning guidelines

Assessment of twin pregnancy Additional features that should be documented in twin pregnancies: Gender Number of placentae Presence of a seperating membrane between sacs Nature of membrane/placenta junction (presence/absence of "twin peak" sign) Subjective assessment of membrane thickness Relative size of amniotic sac volumes (deepest pool or two quadrant AFI) Relative size of twins (significant discrepancy is 20% difference in EFW or greater than 20mm difference in AC) If monochorionic pregnancy or Twin-Twin Transfusion Syndrome is suspected Perform a more detailed assessment Other ultrasound scanning guidelines for pregnancy 1st Trimester 2nd Trimester - Morphology 3rd Trimester

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