F8 and obstructive sleep apnea syndrome: Overall, a total of eleven combinations of reagents, deficient plasmas and calibrators were tested with OSA or CSA: (1) OSA: four combinations with SynthasIL (of which only three were tested by each of the laboratories); (2) OSA: four combinations with SynthaFax (of which only three were tested by each of the laboratories); (3) CSA: three combinations with Coamatic FVIII.