Clotting Activity Tested Single Donor Human Plasma (Blood Derived) Na Citrate 50ml - Clotting Activity Tested Single Donor Human Plasma is whole blood derived. The whole blood is collected from donors in an FDA-approved collection center and processed into plasma via centrifugation. The plasma is frozen immediately after processing. Clotting Activity TestingEach donor's plasma is tested for clotting activity via aPTT assay. Results for your unit will be included on the CofA. Each unit is tested for the standard FDA-required viral markers, and found negative using FDA-approved methods. Innovative Research has a wide network of FDA-approved collection centers across the United States, which allows us to collect from nearly any donor type. We are able to accommodate demographic requests from a variety of genders, races, and ages. We are also able to work with custom collection requests and protocols. If you have custom demographic or collection requests, please let us know.