activated factor vii การใช้

• This may seem counterintuitive given that the deficiency leads to decreased activity in factors of both the intrinsic pathway ( F-IX ) which is monitored by PTT, as well as the extrinsic pathway ( F-VII ) which is monitored by PT . However, factor VII has the shortest half-life of all the factors carboxylated by vitamin K; therefore, when deficient, it is the PT that rises first, since the activated Factor VII is the first to " disappear . " In later stages of deficiency, the other factors ( which have longer half lives ) are able to " catch up, " and the PTT becomes elevated as well.