Laser Photocoagulation Criteria

Pregnancies are considered appropriate for laser photocoagulation in TTTS when they have the following:
  • 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)