ICD-11 classes
19 Certain conditions originating in the perinatal period
Haemorrhagic or haematological disorders of fetus or newborn
KA80 — Fetal blood loss
KA80.3 — Haemorrhage into co-twin

ICD-11 KA80.3 — Haemorrhage into co-twin

Monozygous twins often share a placenta. Vascular anastomoses within the placenta allow for the transfer of blood between the two fetuses. In some cases, the flow is unbalanced and one fetus (larger, plethoric, and polycythaemic twin) has an overload of fluid, while the other (smaller, hydropic twin) becomes anaemic.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.