A few companies offer direct-to-consumer Alzheimer’s blood tests, but experts don’t recommend them. Without a doctor’s involvement, these tests are likely to produce a high rate of false positives — flagging people as at-risk who are actually cognitively healthy or have a low likelihood of Alzheimer’s. Doctors are best positioned to order these tests because they can assess whether testing is appropriate for you, explain the risks and limitations beforehand, and provide proper counseling when results come in.