How accurate is the Galleri test?

Nearly 99% of people who take the Galleri test will receive a No Cancer Signal Detected result. A Cancer Signal Detected result is expected in approximately 1% of Galleri tests in people over 50 years of age. After diagnostic evaluation, around 40% of these people are expected to have a confirmed cancer diagnosis.5


Some of the ways we measure test accuracy are with positive predictive value (PPV) and a false positive rate. A PPV is the probability that a person with a Cancer Signal Detected test result has cancer. In a recent study the PPV was 43.1% for study participants with a Cancer Signal Detected result who were diagnosed with cancer. The false positive rate was 0.5% for participants without cancer.5