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Pregnancy dating

Determining chorionicity and amnionicity

Labelling twins

Screening and testing for chromosomal and structural abnormalities in twin pregnancies

Screening for preterm birth in twin pregnancies 

Screening for pre-eclampsia in twin pregnancies 

Follow-up scans 

Dichorionic twins 

Monochorionic twins 

Other complications during pregnancy.

Single intra-uterine demise.

Twin delivery

Mode of delivery

Timing of delivery