Amarantus Bioscience offers a blood-based assay as

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Amarantus Bioscience offers a blood-based assay as a non-invasive alternative to CSF-based AD tests. The Lymphocyte Proliferation (LymPro) assay is able to differentiate AD individuals from other forms of dementia and healthy individuals by measuring the expression of CD69 protein during stimulated lymphocyte mitosis or cell division. In AD individuals, CD69 expression is down regulated compared to healthy individuals and those with other forms of dementia. The lymphocyte cell surface CD69 markers are measured using flow cytometry. In the test, peripheral blood lymphocytes are used as surrogates for neurons that theoretically exhibit the same cell cycle dysfunction. [b][/b]