Table III.

Stratification of NAIT cases according to risk of intracranial haemorrhage ^*.

Stratum	Definition	Risk
1	History of previous fetus or newborn with thrombocytopenia or intracranial haemorrhage of unknown aetiology;  no HPA antibody detected.	Unknown
2	History of previous fetus or newborn with serologically confirmed fetal or neonatal alloimmune thrombocytopenia  having only thrombocytopenia and no evidence of an intracranial haemorrhage.	Standard
3	History of serologically confirmed fetal or neonatal alloimmune thrombocytopenia and previous fetus or newborn  with intracranial haemorrhage at 28 weeks of gestation or more (includes peripartum and neonatal intracranial  haemorrhage).	High
4	History of serologically confirmed fetal or neonatal alloimmune thrombocytopenia and previous fetus with  intracranial haemorrhage at less than 28 weeks.	Very High

^*Adapted from Pacheco et al, 2011.