Table 1.

Our criteria for performing fetoscopic laser photocoagulation

Conventional criteria

Twin–twin transfusion syndrome at 16–26 weeks

• Monochorionic twin pregnancy

• Oligohydramnios with an MVP ≤ 2.0 cm in the donor

• Polyhydramnios with an MVP ≥ 8.0 cm in the recipient

• Gestational age between 16 + 0 and 25 + 6 weeks of gestation

Nonconventional criteria

Triplets

• Dichorionic triamniotic triplets or monochorionic triamniotic triplets

• Feto‐fetal transfusion syndrome (MVP ≤ 2.0 cm in the donor and ≥8.0 cm in the recipient)

• Gestational age between 16 + 0 and 25 + 6 weeks of gestation

Twin–twin transfusion syndrome after 26 weeks

• Monochorionic twin pregnancy

• Oligohydramnios with an MVP ≤ 2.0 cm in the donor

• Polyhydramnios with an MVP ≥ 10.0 cm in the recipient

• Gestational age between 26 + 0 and 27 + 6 weeks of gestation

Selective intrauterine growth restriction with oligohydramnios

• Monochorionic twin pregnancy

• Estimated fetal weight ≤ −1.5 SD or intertwin estimated fetal weight discordance ≥25%

• Absent or reverse end‐diastolic velocity in the umbilical artery in the smaller twin

• Oligohydramnios with an MVP ≤ 2.0 cm in the smaller twin

• Gestational age between 16 + 0 and 25 + 6 weeks of gestation

MVP, maximum vertical pocket; SD, standard deviation.