TABLE 1.

Calculation of the replacement dose of factor VIII (FVIII) and factor IX (FIX)

Factor	Dose calculation
FVIII	FVIII (U) = Per cent desired rise in plasma FVIII × body weight (kg) × 0.5*
FIX	FIX (U) = Per cent desired rise in plasma FIX × body weight (kg) × 1.4*

*Calculate to the closest vial size and do not discard any factor. Data from references 10 and 11