Diagnosis is usually based on clinical findings, although fetal chromosome testing will show trisomy 13. While many of the physical findings are similar to Edwards syndrome, there are a few unique traits, such as polydactyly. However, unlike Edwards syndrome and Down syndrome, the quad screen does not provide a reliable means of screening for this disorder. This is due to the variability of the results seen in fetuses with<unk> .
Patau syndrome
Bart syndrome
McGillivray syndrome
Sotos syndrome
Keutel syndrome
Cortes Lacassie syndrome
Bart–Pumphrey syndrome
Fryns-Aftimos syndrome