ECA indicates ecarin chromogenic assay; and ECT, ecarin clotting time.

*Anti-Xa assays with low-molecular-weight standards can be used to exclude the presence of drug, but not to quantify drug level.

†Includes HEMOCLOT assay.

‡If calibrated in laboratory using rivaroxaban standard.

§Drug-specific anti-Xa.

(Table data are modified from Cuker et al.¹⁴ )