<prompt> Which is most likely to be increased in Vit K deficiency:P.T.T.P.T.Platelet countFibrinogen time  <response>: Answer is B P.T.: Although PT and PTT both will he affected PT is the single best answer as explained below. Therefore both intrinsic extrinsic mechanisms of the coagulation cascade are affected. Refer previous questions PT PTT both will be prolonged. However, factor VII has sho t12 so PT is the first to be prolonged even in mild vit. K deficiency Later, factors II, IX X will also fall, causing PTT to be prolonged. PT is thus the better choice out of PT and PTT 