| Company | Reagent | Link to information | Remarks |
| Aesku | Aeskulisa Protein S | Method: ELISA
Assay principle: two step |
|
| Affinity Biologicals | PS-EIA set | Affinity Biologicals PS-EIA |
Method: EIA Antibodies: Polyclonal |
| Corgenix | Reaads Total Protein S | Method: EIA
Assay principle: two step |
|
| Helena Laboratories | Free and Total Protein S | Method: ELISA
Assay principle: Two step |
|
| Hyphen BioMed | Zymutest Total Protein S | Hyphen BioMed Zymutest Total Protein S |
Method: EIA Antibodies: Monoclonal |
| Stago | Asserachrom Total Protein S | Stago Asserachrom Total Protein S |
Method: ELISA Antibodies: Monoclonal Assay principle: Two step |