Tip 9: twin-to-twin transfusion syndrome (TTTS)

>25% weight discordance between twins in-utero is an important clinical indicator for TTTS.

Monochorionic (MC) pregnancies are monitored fortnightly from the second trimester (>16/40). Incidence of TTTS in MC twins is 15%.

Reference: NICE. Multiple pregnancy: antenatal care for twin and triplet pregnancies. Clinical guideline [CG129]. Published: Sept 2011.

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