Disclaimer: This infographic is not a validated clinical decision aid. This information is provided without any representations, conditions, or warranties that it is accurate or up to date. BMJ and its licensors assume no responsibility for any aspect of treatment administered with the aid of this information. Any reliance placed on this information is strictly at the user's own risk. For the full disclaimer wording see BMJ's terms and conditions: http://www.bmj.com/company/legal-information/ Covid-19 test calculator How to interpret test results © 2020 BMJ Publishing Group Ltd. Interactive Pre-test probability The likelihood a person has covid-19 based on their characteristics % Test sensitivity The proportion of patients with covid-19 who have a positive test % Test specificity The proportion of patients without covid-19 who have a negative test % If 100 people were tested with these values Have covid-19 Do not have covid-19 True positive False positive False negative True negative Testpositive Testnegative They are appropriately told to self-isolate They are told they do not need to self-isolate and are safe to go out They are told they do not need to self-isolate so they go out and infect more people They are told they need to self-isolate when they would be safe to go out Probability of having covid-19 if test is positive Probability of having covid-19 if test is negative
56 19 1 24 98% 56% people who test positive have covid-19 people who test negative have covid-19 person who tests positive does not have covid-19 people who test negative do not have covid-19 Adjust these values to update graphic below % % % Please enter a number between 0 and 100 Please enter a number between 0 and 100 Please enter a number between 0 and 100
IHCI
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