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 antibody tests Calculator for interpreting test results © 2020 BMJ Publishing Group Ltd. Interactive Pre-test probability Likelihood had covid-19 based on symptoms and background rates Test sensitivity Proportion of people who have had covid-19 with a positive test Test specificity Proportion of people who have not had covid-19 with a negative test If 1000 people were tested with these values True positive False positive False negative True negative Antibodytestpositive Antibodytestnegative May provide relief or reassurance. Risk that they could assume they are immune No change to management or behaviour. Might improve adherence to social distancing Unlikely to change clinical management or behaviour Risk of false reassurance, could assume that they are immune and change behaviour Probability has had covid-19if test is positive Probability has had covid-19if 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 % % % have had covid-19 800 have not had covid-19 200
Please enter a number between 0 and 100 Please enter a number between 0 and 100 Please enter a number between 0 and 100 DRAFT