An isolated prolonged prothrombin time points to the extrinsic pathway, and factor VII is the only factor unique to that pathway. Factors VIII and IX are intrinsic and prolong the aPTT, while factor XII prolongs the aPTT without causing bleeding. Memorize the four combinations of the two screening tests.
학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요.