Modified Strep Score
This formula is a helpful clinical decision tool for determining the indication for further testing and/or antimicrobial therapy in a patient presenting with a sore throat. When using this tool, an important fact to keep in mind is that there is no way to conclusively make a diagnosis of Group A β-hemolytic streptococcal (GABS) pharyngitis based upon history and physical examination alone. It is of note that, even with a Modified Strep score of ≤ 0, there remains a 1-2.5% chance that the patient has GABS pharyngitis. Other factors that may not be accounted for in this tool may still play an important role in sound clinical decision making. For example, if a patient presents with a sore throat and has a score of 1 but has a close contact with recent Group A β-hemolytic streptococcal pharyngitis, it remains prudent to evaluate further and/or proceed with antimicrobial therapy.
Bisno AL, Gerber MA, Gwaltney JM, Kaplan EL, Schwartz RH.
Clinical Infectious Diseases 2002 July 15, 35 (2): 113-25
Centor RM, Witherspoon JM, Dalton HP, Brody CE, Link K.
Medical Decision Making: An International Journal of the Society for Medical Decision Making 1981, 1 (3): 239-46
American Family Physician 2009 March 1, 79 (5): 383-90
McIsaac WJ, Goel V, To T, Low DE.
Canadian Medical Association Journal: CMAJ 2000 October 3, 163 (7): 811-5
Family Practice Management 2003, 10 (8): 68-9
McIsaac WJ, White D, Tannenbaum D, Low DE.
Canadian Medical Association Journal: CMAJ 1998 January 13, 158 (1): 75-83
The Modified Strep Score calculator is created by QxMD.