Technoclone Factor VIII Deficient Plasma is an immunodepleted, lyophilized, stabilized human plasma with a coagulation activity < 1% of factor VIII, prepared from HIV 1/2 Ab negative plasmas. All other coagulation factors are in the normal range. Factor VIII deficient plasma immunads. is used in the determination of coagulation Factor VIII by one-stage method based on the Activated Partial Thromboplastin Time (aPTT).