Monochorionic twins are identical twins that share a placenta, and are at approximately 10% risk of twin-twin transfusion syndrome (TTTS). This can be a serious condition, but is amenable to treatment and/or early delivery, hence the reason why you are having regular scans. The frequency of follow up scans depend on your hospital’s policies; many units scan every 2 weeks or so-and more frequently if there are any concerns, so it may be sensible to discuss the frequency of scans with your obstetrician. Doppler ultrasound of the umbilical arteries would normally be done if there is any concern about TTTS from the scan, but not always done automatically if everything looks OK.
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