One 2020 meta-analysis examining 44 studies showed that FIT tests correctly identified four out of five cases of colorectal cancer. These detected cases stages were II through IV. It’s important to note that the test sensitivity was shown to be lowest for the earliest stages — with colon cancer, early detection is crucial. While FITs are almost as useful as colonoscopies, these tests are still susceptible to user error. Research from 2018 suggests there's also a risk of false-positive and false-negative results.