title: The Severity of Illness Index and laboratory testing.
authors.forename: A R
authors.initials: AR
authors.lastname: Willan
authors.forename: T A
authors.initials: TA
authors.lastname: MacKenzie
mesh_terms: D019411:Clinical Laboratory Techniques; D003953:Diagnosis-Related Groups; D015276:Health Care Rationing; D006801:Humans; D009864:Ontario; D012720:Severity of Illness Index