Chorionicity tells whether twins share a placenta. It decides how closely a twin pregnancy needs to be monitored. Learn the difference.
The chorion is the outer membrane that forms the placenta. The number of chorions tells you whether the twins have separate or shared placentas. It is best determined by ultrasound in the first trimester, between about 11 and 14 weeks, when it is most accurate.
Monochorionic diamniotic twins usually have scans every two weeks from about 16 weeks to look for TTTS and growth differences. Dichorionic twins are generally scanned less often, such as every four weeks, depending on the specialist's plan. Delivery timing may also differ.
Knowing the type of twin pregnancy early lets your team plan the right monitoring. Dr Malathi G. Prasad at Trichy Fetal Medicine and Fertility Centre in Trichy can confirm chorionicity and arrange the follow-up your twins need.
For appointments, the twin specialised clinic page has the details, and our fetal medicine specialists can advise whether it fits your situation.
This guide is for general information and does not replace a consultation with a fetal medicine specialist.
In line with the PCPNDT Act, we do not perform or support sex determination.
Twin Specialised Clinic
Specialist monitoring and care for twin and multiple pregnancies.
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