Laser Photocoagulation Criteria

• Single placenta (monochorionic)
• Excess fluid (polyhydramnios) present in recipient twin
• Low fluid (oligohydramnios) present in donor twin
• Prominent bladder in the recipient twin and an absent or small bladder in the donor twin
• Thin dividing membrane between the twins

Patients with the following situations may not be suitable for laser photocoagulation in TTTS:

• Pre-term labor with a short or open cervix
• Prior septostomy (see Alternatives to Treatments for description)
• Abnormal genetic studies
• Ruptured membranes
• Infection of the amniotic fluid (chorioamnionitis)