1960
DOI: 10.1093/ajcp/34.4.371
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Osborne Allen Brines 1894–1960

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“…12 In the mid-1950s, the activated partial thromboplastin time (APTT) test, the thromboplastin generation test, the prothrombin consumption test, and the clot retraction test were added. 13 During these early years, Dr. Owen continued Dr. Nygaard's study of clot detection by optical spectrochemistry. He found that when a PT specimen was analyzed with spectrophotometry the change in optical density precisely matched the coagulation time.…”
Section: The Establishment and Rapid Growth Of The Clinical Coagulati...mentioning
confidence: 99%
“…12 In the mid-1950s, the activated partial thromboplastin time (APTT) test, the thromboplastin generation test, the prothrombin consumption test, and the clot retraction test were added. 13 During these early years, Dr. Owen continued Dr. Nygaard's study of clot detection by optical spectrochemistry. He found that when a PT specimen was analyzed with spectrophotometry the change in optical density precisely matched the coagulation time.…”
Section: The Establishment and Rapid Growth Of The Clinical Coagulati...mentioning
confidence: 99%
“…In 1904, Morawitz proposed the four-factor theory of coagulation, building upon the description of fibrinogen by Hammerstein and fibrin ferment (now more appropriately termed as thrombin) by Schmidt. 8,9 Mellanby summarized the understanding of the process as follows: "the coagulation of blood is due to the action of fibrin ferment on fibrinogen (factor I). Fibrin ferment does not circulate but is produced on tissue injury which liberates thrombokinase (factor III).…”
mentioning
confidence: 99%