The Guardant Health Shield test, one committee member said, “is better than nothing for patients who are getting nothing, but it is not better than a colonoscopy.”The Guardant Health Shield test, one committee member said, “is better than nothing for patients who are getting nothing, but it is not better than a colonoscopy.”Read MoreColon and Colorectal Cancer, Tests (Medical), Food and Drug Administration, Guardant Health Inc, Blood, Colonoscopy, FecesNYT > Health