Discover how MASKS, CONTACT TRACING, and GROUP ACTIVITIES impact the need for testing

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Changing your mitigation strategies may change your numbers. Explore how better approaches lead to better outcomes.

COVID-19 Testing Impact Calculator

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Assumptions

Calculations

The COVID-19 Testing Impact Calculator uses the below default assumptions for all calculations.

  1. Number of days a person is contagious is assumed to be 10 days.
  2. The percentage of the US populations that develops COVID-19 symptoms after becoming infected, also known as Symptomatic is assumed to be 60%.
  3. The time an individual person must wait to be sampled is assumed as 15 minutes.
  4. The maximum number of days between testing is assumed as 30 days.

Test Groups

The assumptions for all Test Groups are exemplary tests. The default assumptions do not represent any one individual test.

The COVID-19 Testing Impact Calculator provides education and guidance for Asymptomatic Screening of an organization.

If tests are used for Asymptomatic Screening protocols, most tests are currently used off-label and under practitioner guidance.  As new tests are approved, and new studies are available, website content will be updated.

Currently, there is limited to no data available for Asymptomatic Screening Test performance.  The ‘default’ chosen for each test group is a conservative estimate based upon consultation with industry experts. 

Test Sensitivity & Test Specificity

Lower sensitivity may result in more false negatives.  The test is more likely to miss a true infection by producing a negative test result in people who are actually infected with COVID-19.

Recommendation: 

  • If you receive a negative test result, but are symptomatic, then consider quarantining and obtain a confirmatory test.

Lower specificity may result in more false positives.  If you receive a positive result, it indicates that you are likely to be infected with COVID-19, particularly if you are tested during the first week of infection and are symptomatic.   

Recommendations:

  • If you receive a positive result, you are likely to be infected with COVID-19 if you are symptomatic.  
  • If you receive a positive result when using a test with specificity below 99% and are not symptomatic (asymptomatic), the likelihood of false positives exists. You should consider a confirmatory molecular PCR test. 

 “WhenToTest.org” (“Software Model”)

COVID-19 Testing Impact Calculator

This website should be used for information and education purposes only. 

End User License Agreement (“EULA”)

This EULA is a contract between The General Hospital Corporation, Inc., d/b/a Massachusetts General Hospital (“MGH”), the Massachusetts Institute of Technology and its affiliates (“MIT”) and you, each a “Party”, and collectively the “Parties”, and provides you with a license to use the MGH/MIT software modeling tool to assess an organization’s COVID-19 testing options referred to as WhenToTest (the “Software Model”) subject to the terms and conditions set forth below.  

This EULA governs your use of the Software Model. If you are agreeing to this EULA on behalf of a company or other entity, you represent that you have the authority to agree to the terms and conditions of this EULA on behalf of such entity, and that such entity hereby agrees to be bound by these terms.  By accessing the Software Model, you are agreeing to this EULA.  If you do not agree to this EULA, MGH and MIT will not and do not license the Software Model to you and you must not access the Software Model.

Please note that the Software Model is intended to be used for non-commercial research, informational and educational purposes; it is NOT made available here for any commercial or clinical use.    MGH and MIT cannot and do not assume any responsibility for the Software Model made available for use under this EULA.

IMPORTANT – Please Read Carefully:

  1. License to Use the Software Model.

Subject to the terms of this EULA, MGH and MIT hereby grant to you, the “Licensee,” a royalty-free, non-exclusive, non-transferable, revocable license to access and use the Software Model for non-commercial research, academic, and/or evaluation purposes only.  No right to sublicense or assign this license to others is granted herein.

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The term of this EULA shall begin upon your acceptance of the terms set forth herein.  You may terminate this EULA at any time by discontinuing your use of the Software Model.  Either MGH or MIT may terminate this EULA at any time by denying access to the Software Model.

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THE SOFTWARE MODEL HAS NOT BEEN REVIEWED OR APPROVED BY THE UNITED STATES FOOD AND DRUG ADMINISTRATION OR ANY OTHER AGENCY.  THE SOFTWARE MODEL MUST NOT BE USED TO MAKE A CLINICAL DIAGNOSIS OR REPLACE OR OVERRULE A LICENSED HEALTH CARE PROFESSIONAL’S JUDGMENT OR CLINICAL DIAGNOSIS, OR AS THE SOLE MEANS OF TRACKING INFORMATION RELATED TO A PATIENT. THE SOFTWARE MODEL MAY BE USED ONLY FOR NON-COMMERCIAL RESEARCH, INFORMATIONAL AND EDUCATIONAL PURPOSES.

YOU acknowledge that, whether caused by computer error, human error, or because of some other reason, results, reports, and other information may be miss-delivered or undelivered and/or include incorrect data.  YOU UNDERSTAND AND AGREE THAT YOU MUST REVIEW AND VERIFY INFORMATION OBTAINED VIA THE SOFTWARE MODEL TO ENSURE THAT THE INFORMATION IS ACCURATE AND COMPLETE. YOU ACKNOWLEDGE THAT THE MODEL IS IN RESEARCH PHASE AND ALL OUTCOMES FROM USE OF THE MODEL ARE NOT KNOWN.  YOU ACKNOWLEDGE THAT YOUR USE OF THE MODEL IS AT YOUR OWN RISK.

You may not copy or distribute the Software Model in any form.  You may not rent, lend, lease, sell, resell, license or otherwise transfer for value, the Software Model.  You are not authorized to give others access to the Software Model.  You agree not to reverse engineer, decompile, disassemble, or attempt to derive the source code or equivalent of the Software Model.  You agree not to remove or obscure any copyright notices or other attribution on or in the Software Model.

You also agree that the Software Model shall not be used as the basis of a commercial software or hardware product, or incorporated into a commercial product, and that the Software Model shall not be rewritten in another computer language or otherwise adapted to circumvent the need for obtaining a license from MGH and MIT for use of the Software Model.

Your use of the Software Model may also require use of other software, or patent rights. You are responsible for securing any additional software and licenses you may need.

You warrant that you will comply in all material respects with all applicable federal, state and local laws, rules and regulations governing your use of the Software Model including, but not limited to, the Health Insurance Portability and Accountability Act of 1996, the Health Information Technology for Economic and Clinical Health Act provisions of the American Recovery and Reinvestment Act of 2009, Pub. Law No. 111-5, the Federal Food, Drug, and Cosmetic Act, and their implementing regulations; in each case as amended from time to time.

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TO THE FULLEST EXTENT PERMITTED BY LAW, MGH and MIT PROVIDE THE SOFTWARE MODEL AND CONTENT ON THE SITE “AS IS” BASIS AND WITH ALL FAULTS, ERRORS AND DEFECTS, AND NEITHER MGH NOR MIT NOR ANY OF THEIR RESPECTIVE PERSONNEL NOR ANY OF THEIR RESPECTIVE AFFILIATES ARE RESPONSIBLE FOR ENSURING THAT ANY IMPLEMENTATION OF THE SOFTWARE MODEL OR SITE CONTENT WILL BE CLINICALLY SOUND, OPERATE WITHOUT ERROR OR INTERRUPTION, OR OTHERWISE BE SUCCESSFUL. THE RIGHTS GRANTED IN THIS EULA ARE MADE AVAILABLE WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT.

YOU EXPRESSLY ACKNOWLEDGE AND AGREE THAT: (A) NEITHER MGH NOR MIT IS RESPONSIBLE FOR ANY HEALTH PROBLEMS, INJURIES OR DEATH THAT MAY RESULT FROM YOUR USE OF, AND/OR RELIANCE UPON, THE SOFTWARE MODEL; (B)  USE OF THE SOFTWARE MODEL WILL NOT REPLACE EXPERT DECISION-MAKING BY THE INSTITUTION CONCERNING MATTERS RELATED TO THE SUBJECT MATTER OF THE SOFTWARE MODEL; AND (C) YOU WILL COMPLY WITH ALL LAWS AND GOVERNMENTAL RULES, REGULATIONS AND GUIDELINES, INCLUDING ANY SAFETY PRECAUTIONS, THAT ARE APPLICABLE TO THE MODEL AND RELATED CONSIDERATIONS CONCERNING COVID-19.  IT IS UNDERSTOOD THAT NEITHER MGH NOR MIT IS PROVIDING MEDICAL OR OTHER HEALTH-RELATED ADVICE THROUGH THE SOFTWARE MODEL.  

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In consideration of MGH and MIT providing access to the Software Model free of charge, you agree not to bring any claim, lawsuit, or action for any damages, costs, liabilities, settlement amounts and/or expenses (including attorneys’ fees) against MGH or MIT or their respective affiliates, trustees, directors, officers, faculty, students, medical and professional staff, employees, staff members, agents or contractors arising out of or related to your use of the Software Model.

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The license granted under this EULA is subject to the rights, conditions and limitations imposed by U.S. law including without limitation 35 U.S.C. § 202 et seq. and regulations pertaining thereto, the N.I.H. Grants Policy Statement, and the N.I.H. Guidelines for Obtaining and Disseminating Biomedical Research Resources.

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