There are new blood tests for Alzheimer’s. Should I have one?

Per The Conversation, Australia's Therapeutic Goods Administration has approved new blood tests for Alzheimer's disease, and Neuroscience Research Australia in Sydney has opened a new diagnostic center. These tests measure phosphorylated tau two seventeen, a protein that closely mirrors Alzheimer's brain changes—a major step up from the invasive spinal taps and expensive brain imaging doctors previously relied on. Here's the critical part: these tests don't diagnose Alzheimer's. They detect biomarkers indicating brain changes may be present. Your doctor will still need to interpret results against your symptoms, medical history, cognitive testing, and possibly additional imaging, because memory problems stem from many causes, from depression to thyroid disease. The tests are intended for people already experiencing cognitive concerns or mild cognitive impairment—not as a screening tool for healthy adults. They're not currently covered by Medicare, but they're becoming increasingly relevant as new treatments emerge. Therapies like lecanemab can modestly slow cognitive decline in early-stage cases, making faster diagnosis increasingly valuable.

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