Table 4.

Assessment of coagulation for patients on anticoagulants

Test	Anticoagulant				Reference range
	LMWH/Fondaparinux	Thrombin inhibitors Argatroban Bivalirudin Dabigatran	Vitamin K antagonist Warfarin	FXa inhibitors Rivaroxaban Apixaban
PT	Normal	Prolonged	Prolonged	Prolonged	<35 sec
aPTT	Normal	Prolonged	Normal	Prolonged	<13.5 sec
TT	Normal	Prolonged	Normal	Normal	<21 sec
BT	Normal	Normal	Normal	Normal	<21 sec
Anti-FXa	Detectable	Not detectable	Not detectable	Detectable	<0.1
TTI	No inhibition	Inhibition	No inhibition	No inhibition

TT, thrombin time; BT, bleeding time; TTI, tissue thromboplastin inhibition