Why does the Galleri test need to be used in addition to other single cancer screening tests such as colonoscopy or mammography?

The Galleri test is intended to be used in addition to—and not replace—other cancer screening tests your healthcare provider recommends. Single-cancer screening tests are recommended because they have been proven to save lives by detecting cancer early. Adding the Galleri test to annual wellness visits allows you to go further with cancer screenings.

The Galleri test does not detect a signal for all cancers and not all cancers can be detected in the blood.