Criteria for Laser Photocoagulation for TTTS

Patients are considered for laser photocoagulation when the pregnancy is between 18 and 26 weeks gestation and fulfill the following criteria:

  • Both the fetuses are of the same sex
  • Single placenta (monochorionic diamniotic)
  • Minimal fluid in donor (less than 2 cm maximal vertical pool)
  • Too much fluid in the recipient (more than 8 cm maximal vertical pool)
  • Thin dividing fetal membrane
  • Absent bladder in the donor twin or absent/reversal of end diastolic flow in the umbilical artery
  • Absence of other structural problems in either twin
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