F5 and hyperinsulinemic hypoglycemia, familial, 4: There was no correlation between FI, FXI, FXII, and combined FV+FVIII deficiency with ISTH BAT score, while a study conducted by Saes et al. [11] showed a strong correlation between baseline coagulation factor activity level and the ISTH BAT score for FII deficiency and FX deficiency.