Twin to Twin Transfusion Syndrome (TTTS) is a rare but life-threatening condition that affects 10 to 15 percent of identical twins that share a placenta (monochorionic twins). TTTS can also occur in triplet or higher order pregnancies with monochorionic twins.

TTTS can have serious consequences to the babies so you will need to be monitored very closely by your doctors.

This video explains TTTS and the treatment option called laser therapy.

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What is TTTS?


If you are worried please talk to your midwife and doctors as they are best placed to explain your situation and treatment options for you.

Our Twinline listening service can provide a reassuring listening ear so you are not alone but we do not provide medical advice.


The diagrams below illustrate TTTS in a twin and triplet pregnancy.

Supported by the GIFT-Surg international research project which is funded by the Wellcome Trust and EPSRC


For further information please download our Complications Guide, which is designed to help you to understand some of the conditions associated with twin, triplet and higher-order pregnancies.