Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2012 Mar 8;62(5):727–734. doi: 10.1136/gutjnl-2011-301917

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/3.0/ and http://creativecommons.org/licenses/by-nc/3.0/legalcode

PMC Copyright notice

Example of calculation of the added performance of two-sample faecal immunochemical tests (FIT) compared with one-sample FIT screening. *This example provides the calculation of the positivity rate of two-sample FIT with at least one sample positive at a cut-off level of 50 ng haemoglobin/ml. The method of calculation is similar for both the positivity rate and detection rate, as well as for the different two-sample FIT positivity criteria (ie, at least one sample positive, both samples positive and the mean of both samples positive).