... During the test, a doctor inserts a thin needle into the lower back to remove a small amount of fluid. The fluid is then tested for important biomarkers. Doctors look for two main changes in the CSF: lower levels of beta-amyloid and higher levels of tau proteins. Low beta-amyloid levels suggest that plaques are forming in the brain. ...
How Is Alzheimer’s Disease Diagnosed? Tests and More
... During the test, a doctor inserts a thin needle into the lower back to remove a small amount of fluid. The fluid is then tested for important biomarkers. Doctors look for two main changes in the CSF: lower levels of beta-amyloid and higher levels of tau proteins. Low beta-amyloid levels suggest that plaques are forming in the brain. ...
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