Twin to Twin Transfusion Syndrome (TTTS) is a rare but life-threatening condition that affects around 15% of identical twins that share a placenta (monochorionic twins).

The Registry collects data on complicated multiple pregnancies, monochorionic twin pregnancies and uncomplicated triplet pregnancies. Read more about how this data helps us in research here.

Harriet thought she had passed the point of having TTTS with her twins after reaching almost 25 weeks; but in a rapid turn of events, the condition was picked up and she had emergency laser surgery. Read Harriet's story...