Test articles comprise a solid phase membrane having dry thromboplastin immobilized thereon or within. The thromboplastin is substantially free from substances which might cause aberrant functioning intermediate transition states as the thromboplastin is rehydrated with liquid sample. Coagulation neutral...http://www.google.com.au/patents/US5418141?utm_source=gb-gplus-sharePatent US5418141 - Test articles for performing dry reagent prothrombin time assays
