F8 and von Willebrand disease (hereditary or acquired): The general findings otherwise highlighted here (Figure 3, Figure 4 and Figure 5) complicate both clinical and laboratory test practice, since even a normal FVIII level may not always exclude the presence of an FVIII inhibitor (although it usually will), and a low level of FVIII does not necessarily reflect the presence of an FVIII inhibitor (since it may represent CHA or even von Willebrand disease [VWD]) [33].