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Days of Therapy and Antimicrobial Days: Similarities and Differences Between Consumption Metrics

  • Nathaniel J. Rhodes (a1), Jamie L. Wagner (a2), Elise M. Gilbert (a3), Page E. Crew (a1), Susan L. Davis (a4) and Marc H. Scheetz (a1)...


Benchmarks for antimicrobial consumption measured in antimicrobial days are beginning to emerge. The relationship between the traditional measure of days of therapy and antimicrobial days is unclear. We observed a high intermethod correlation (R2=0.99): antimicrobial days were 1.9-fold lower than days of therapy across agents. Individual institutions should correlate these measures.

Infect Control Hosp Epidemiol 2016;37:971–973


Corresponding author

Address correspondence to Marc H. Scheetz, PharmD, MSc; Associate Professor of Pharmacy Practice; Midwestern University Chicago College of Pharmacy; 555 31st St., Downers Grove, IL 60515 ( or to Nathaniel J. Rhodes, PharmD, MSc, Assistant Professor of Pharmacy Practice; Midwestern University Chicago College of Pharmacy, 555 31st St., Downers Grove, IL 60515 (


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