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Emergency Medicine · Critical Care

Modified Shock Index (Allcock) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Result

Complete all required inputs to calculate the score.

Formula inputs

  • Heart rate (/min)Accepted range: 20 to 250
  • Systolic blood pressure (mm Hg)Accepted range: 40 to 300
  • Diastolic blood pressure (mm Hg)Accepted range: 20 to 200

Primary source

Allcock TM et al. The modified shock index: an emergency department triage tool for predicting morbidity and mortality. Am J Emerg Med. DOI: 10.1016/j.ajem.2014.10.052. PMID: 25536449. Scope: modified shock index calculated as heart rate divided by mean arterial pressure (mm Hg). (2015)

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