The Test Works. Your Doctor Probably Isn't Ordering It.

Earlier this month we covered the good news: with a blood test in hand, a primary care doctor's accuracy in diagnosing Alzheimer's jumps from 65% to 93% (our take on the AAIC findings). Here is the number that didn't make the headline. Fewer than one in four of those doctors are actually ordering the test.

Same technical capability, entirely different navigation outcome. The technology is identical across both stories; what changes is whether it reaches the exam room. The survey is blunt about why, and it isn't cost or availability: it's the physician's own confidence. Doctors less sure of their footing with dementia refer out or wait; the ones ordering the test skew academic and research-affiliated. So the test is in the guidelines, it's on the shelf, and the appointment still ends with "let's wait and see."

Our earlier piece was about the test moving into a room a family can actually get into, the regular doctor's office instead of a months-out memory clinic. This is the next wall in: whether anyone in that room reaches for it. When the professional default is to wait, the person who changes the outcome is often the family member who walked in prepared. You do not need to understand the biomarker. You need one sentence.

So at the next appointment, if something feels off, ask it plainly: "Would a blood-based biomarker test help us find out sooner?" The capability is already in the room. Sometimes all it takes is for someone to ask.