What is twin-to-twin transfusion syndrome?
Twin-to-twin transfusion syndrome (TTTS) is a rare but serious condition in pregnancy involving identical twins who share one placenta (also called monochorionic twins). While most identical twins share blood and nutrients from the same placenta equally, twins affected by TTTS don’t. Instead, one twin (the donor twin) receives less blood supply than the other twin (the recipient twin). This means the donor twin has less blood volume, but the recipient twin has more blood volume. This blood flow imbalance can cause TTTS.
