Per Cent Prothrombin Activity Unacceptable

Henry B. Soloway, M. Eric Gershwin

Research output: Contribution to journalLetterpeer-review


To the Editor: Gershwin and Gude (N Engl J Med 288:141, 1973) have unwittingly demonstrated the confusion that exists concerning the meaning of the terms “prothrombin time” and “per cent prothrombin activity.” In their recent report they refer to a “Quick prothrombin time of 20 per cent control,” and to an admission prothrombin time that was “less than 10 per cent of control.” In both instances the context indicates that the authors were referring to per cent prothrombin activity. The concept of per cent prothrombin activity is anachronistic, and laboratories should be discouraged from reporting data in this manner. The ….

Original languageEnglish (US)
Number of pages1
JournalNew England Journal of Medicine
Issue number13
StatePublished - Mar 29 1973
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)


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