<prompt> All are true bout Oral anticoagulants EXCEPT:Acts in vivoActs both in vivo and in vitroInterferes with synthesis of Vit KCauses Hematuria  <response>: Ans. b Acts both in vivo and in vitro ORAL ANTICOAGULANT is warfarin. It is used only in vivo body, NOT in vitro lab. Warfarin is not used to store blood. It acts by inhibiting Vitamin K. Due to overdose, hematuria is the First manifestation noted. Dose monitoring is done by INR. Antidote of warfarin overdose: Vitamin KPT Prothrombin TimeaPTT activated Partial Thromboplastin Time Assess activity of Extrinsic coagulation pathway Used when on warfarin treatment WePT: Warfarin for extrinsic; PT value assessed. Assess activity of Extrinsic coagulation pathway. Used while on heparin treatment. HINT: Heparin for Intrinsic; aPTT value assessed. 