Version July 2025
| Poor prognostic factors in TRAP sequence |
| High-output heart failure |
| Hydrops fetalis |
| Persistently absent or reversed end-diastolic blood flow in the umbilical artery, pulsatile blood flow in the umbilical vein, and/or reversed a-wave in the ductus venosus Doppler waveform |
| Acardiac twin weight to pump twin weight ratio >0.70 |
| Polyhydramnios |
| Monoamniotic pregnancy |
