Outcome of twin gestations

Chorioamnionicity	Loss of one or both twins at <24 weeks when both are alive at 11 to 13 weeks (%)	Fetal or neonatal death of one or both twins at ≥24 weeks when both are alive at 24 weeks (%)	Preterm birth <37 weeks with at least one live birth when both twins are alive at 11 to 13 weeks (%)	Preterm birth <32 weeks with at least one live birth when both twins are alive at 11 to 13 weeks (%)	Small for gestational age (<5th percentile) birth when both twins are alive at 11 to 13 weeks (%)
DC	2.3	1.0	48.6	7.4	31.2
MCDA*	7.7	2.5	88.5	14.2	37.8
MCMA	21.8	9.3	100	26.8	33.2

Pregnancy outcome data for 6225 twin pregnancies with two live fetuses at 11 to 13 weeks of gestation with no major abnormalities: 4896 DC pregnancies, 1274 MCDA pregnancies, and 55 MCMA pregnancies.

DC: dichorionic; MCDA: monochorionic diamniotic; MCMA: monochorionic monoamniotic.
* 10% of these pregnancies underwent fetoscopic laser ablation for twin-twin transfusion syndrome or selective growth restriction; outcome data would have been poorer without this intervention.

Data from: Litwinska E, Syngelaki A, Cimpoca B. Outcome of twin pregnancy with two live fetuses at 11-13 weeks' gestation. Ultrasound Obstet Gynecol 2020; 55:32.

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Outcome of twin gestations