Degree of fucosylation correlates with neonatal platelet counts in FNAIT and clinical severity. Degree of fucosylation was compared with neonatal platelet counts in FNAIT directly after delivery (A), as well as with the clinical disease severity score (B). The scores are as follows: 0 indicates no symptoms; 1, mild symptoms (petechiae); 2, moderate symptoms (other bleeding, including organ bleeding); and 3, severe symptoms (intracranial hemorrhages) (B). Statistical analyses were performed using Spearman rank correlation, with a positive correlation in panel A (ρ = 0.320) and a negative correlation in panel B (ρ = −0.377). *P ≤ .05.