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%.

External references: NICE, 2011. Multiple pregnancy: antenatal care for twin and triplet pregnancies. NICE guidelines: CG129.

Previously published: 10/10/13

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