| Company | Reagent | Link to information | Remarks |
| CoaChrom | CoaChrom Prothrombin | Method: Chromogenic
Assay principle: two step Activator: Snake venom enzyme Ecarin from Echis Carinatus Substrate: S-2238 |
|
| Werfen | S-2238 | Werfen S-2238 | Method: Chromogenic
Substrate: S-2238 |