The test can be completed via a blood draw at a routine medical exam, making it less invasive than a colonoscopy. It works by detecting signals of cancer in the blood, such as DNA shed by tumors ...

Blood is drawn and shipped to the company’s lab in North Carolina to test for more than 50 cancers. The results are available in seven to 10 days. Patients receive one of two messages: ...

No. The F.D.A., and Alzheimer’s experts, emphasized that the blood test should be given only to people who are already experiencing cognitive decline and are ages 55 and older.