<prompt> The estimation of prothrombin level is useful in the following clotting factor deficiency , except2579  <response>: ref Robbins 8e p119;7e p128;9e p119 The PT test evaluates how well all of the coagulation factors in the extrinsic and common pathways of the coagulation cascade work together. Included are: factors I Fibrinogen, II Prothrombin, V, VII and X. The PTINR may be done at the same time as a PTT, which evaluates the clotting factors that are pa of the intrinsic and common pathways: XII, XI, IX, VIII, X, V, II prothrombin, and I fibrinogen as well as prekallikrein PK and high molecular weight kininogen HK. 