Calc Function

    • Calcs that help predict probability of a diseaseDiagnosis
    • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
    • Disease is diagnosed: prognosticate to guide treatmentPrognosis
    • Numerical inputs and outputsFormula
    • Med treatment and moreTreatment
    • Suggested protocolsAlgorithm





    Chief Complaint


    Organ System


    Patent Pending

    Scientific Advisory Board

    Sir Graham Teasdale, MBBS

    Sir Graham Teasdale, MBBS, is the co-creator of the Glasgow Coma Scale. He is the immediate past president of the Royal College of Physicians and Surgeons of Glasgow and the Society of British Neurological Surgeons. He was knighted in 2006 for his contributions to neurosurgery and evaluation and management of head injury. Sir Teasdale is retired from clinical practice but still maintains an active interest in research in traumatic brain injury.

    Ian Stiell, MD, MSc, FRCPC

    Ian Stiell, MD, MSc, FRCPC, is a distinguished professor in the department of emergency medicine at the University of Ottawa. He also serves as chair of the department and leads the Ian Stiell research group. Dr. Stiell is a key proponent of evidence-based medicine and has created or co-created multiple widely-used decision rules in the field of emergency medicine, including the Canadian CT Head Rule, Ottawa Ankle Rule, Canadian Syncope Risk Score, Ottawa Subarachnoid Hemorrhage Rule, and others.

    Jerome Hoffman, MD

    Jerome Hoffman, MD, is a practicing physician at UCLA, where is a professor of medicine and emergency medicine and has been on full-time faculty since 1979. Dr. Hoffman is well-known as a critic of the evidence behind some widely-accepted practices such as thrombolysis in stroke. He has been featured in This American Life, Mother Jones, and various online emergency medicine publications. He was voted one of the Heroes of Emergency Medicine by the American College of Emergency Physicians.

    Robert Balk, MD

    Robert Balk, MD, is a practicing physician and professor of pulmonary disease and critical care medicine at Rush University Medical Center in Chicago. He also serves as director of the pulmonary and critical care medicine division. Dr. Balk has published extensively in critical care literature and is an international expert on sepsis and SIRS.

    Steven Stack, MD

    Steven Stack, MD, is the immediate past president of the American Medical Association, the youngest person to hold the position since 1854, and its first emergency physician president. He currently serves as medical director of the emergency department at Team Health in Lexington, Kentucky. Dr. Stack is a leader in advancing health information technology and has served on numerous advisory boards, including as chair of the AMA’s Health Information Technology Advisory Group.

    Gregory Lip, MD

    Gregory Lip, MD, is an academic clinical cardiologist in Birmingham, England, where he is also a professor of cardiovascular medicine and director of the Haemostasis, Thrombosis, and Vascular Biology Unit. He also holds multiple honorary professorships internationally. Dr. Lip is one of the world’s leading experts in risk stratification of atrial fibrillation, with his research directly informing the widely-used CHA2DS2-Vasc and HAS-BLED Scores.

    Nathan Kuppermann, MD, MPH

    Nathan Kuppermann, MD, MPH, is a professor of emergency medicine and pediatrics and the Bo Tomas Brofeldt Endowed Chair of Emergency Medicine at the University of California, Davis. He is principal investigator of the Pediatric Emergency Care Applied Research Network (PECARN) and chair of the global executive committee of the Pediatric Emergency Research Network (PERN). Dr. Kuppermann has co-authored hundreds of papers in peer-reviewed journals in pediatric emergency medicine.

    Robert Centor, MD

    Robert Centor, MD, is the retired regional dean for the Huntsville Regional Medical Center and professor in the general internal medicine division at the University of Alabama at Birmingham. He has published widely in the diagnosis and management of adult sore throats and is Chair Emeritus of the Board of Regents for the American College of Physicians. Dr. Centor has an active social media presence and has been writing his blog,, since 2002.