The COVID Inpatient Risk Calculator: CIRC

Preset values are the mean values of the study participants. For laboratory values, please input the first available lab value in the first 48 hours after admission for each of the requested parameters. For respiratory rate and pulse, enter the median value over the first 24hrs. Use preset values when patient values are unavailable.

The COVID Inpatient Risk Calculator (CIRC) uses factors on admission to the hospital to predict the likelihood that a patient admitted with COVID-19 will progress to severe disease* or death within 7 days of arrival. This model was derived from the first 832 patients admitted to the Johns Hopkins Health System between March 1, 2020 and April 24, 2020, with follow-up through June 24, 2020 (

*severe disease - requiring any of the following: high flow nasal cannula, non-invasive positive pressure ventilation, invasive mechanical ventilation, ECMO, vasopressor support

DISCLAIMER: CIRC is an algorithmic tool ("Algorithm") developed by faculty at the Johns Hopkins University School of Medicine and the Johns Hopkins University Bloomberg School of Public Health. The Algorithm is not an FDA-registered clinical decision support tool and has not been reviewed or approved for any use-including diagnosis or treatment of disease or other conditions, including Covid-19-by the FDA. The Johns Hopkins University and The Johns Hopkins Health System, Inc. (collectively, "Johns Hopkins") are making the Algorithm publicly available for academic and research use only. The Algorithm does not replace the independent clinical judgment of healthcare professionals or the performance of any clinical assessment. The Algorithm is not intended for the diagnosis or treatment of any disease or condition, including Covid-19 in individual patients. Johns Hopkins hereby disclaims any and all representations and warranties regarding the Algorithm, including warranties of fitness for use in clinical decision making and warranties that the Algorithm works as intended, is clinically safe, does not infringe third party intellectual property rights, and/or is free from defects and bugs.