A sensitive and specific assay for plasminogen activators

Daniel S. Smith, James Harmon, Whyte G. Owen

Research output: Contribution to journalArticlepeer-review


A simple, sensitive and specific assay for plasminogen activators is described. The assay utilizes fluorescein-labeled fibrinogen or fibrin at low concentrations, and enables simultaneous evaluation of the plasminogen and fibrin dependence of the reaction, that is, discrimination of tissue-type and urokinase-type plasminogen activators, and non-specific proteolysis. Addition of antisera verify identification of the activator species. The assay reagent contains plasminogen and fluorescein-labeled fibrinogen, to which is added the specimen and then then thrombin, either at the initiation or the termination of the reaction. Supernatant fluorescence is proportional to plasminogen activator concentration. With a four-hour incubation, 1 milliunit (14 pg) of tissue (melanoma) plasminogen activator (TPA) or 2 milliunit (36 pg) of urokinase (UK) may be detected.

Original languageEnglish (US)
Pages (from-to)533-541
Number of pages9
JournalThrombosis research
Issue number4
StatePublished - Feb 15 1985
Externally publishedYes


  • fibrinolysis
  • plasminogen activators

ASJC Scopus subject areas

  • Hematology


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