When doctors scan the whole body with an MRI on people who feel perfectly fine and have no symptoms, they find cancer in about 1 in 64 of them.

If you get a full-body MRI scan and have no symptoms or known cancer risks, about 1 in 60 people might be found to have cancer they didn’t know about — so it’s kind of helpful, but not super reliable, for finding hidden cancers in healthy people.

When healthy adults without symptoms get a full-body MRI scan, about 1 in 100 are found to have early-stage cancer—like in the lungs, kidneys, or prostate—and catching it this early might help treat it better.

When doctors use full-body MRI scans on people who feel fine, about two out of three cancers they find are in body parts that don’t usually get checked during routine screenings—so this scan might catch cancers other tests miss.

When doctors scan the whole body with an MRI in people who feel fine and have no reason to think they have cancer, they find cancer in about 1.57 out of every 100 people.

When doctors use whole-body MRI scans on people who feel fine and aren’t sick, they find cancer in only about 1.57 out of every 100 people — so it’s not very good at catching cancer early in healthy folks.