F8 and obstructive sleep apnea syndrome: For FVIII, FIX, FXI, and FXII OSA, correlation studies were not made since these OSA methods were performed according to the instrument and reagent manufacturer Siemens on Atellica and were LDTs on BCS‐XP (Actin FS on Atellica COAG 360 and PTT automate on BCS‐XP).