Patent ID: 7700309

Claim:
A method for diagnosing probable Alzheimer's disease in a patient, the method comprising: measuring the amount of one or more soluble Aβ(x-≧41) in a cerebrospinal fluid sample; comparing the measured amount of the soluble Aβ(x-≧41) with a predetermined indicator value of the Aβ(x-≧41); measuring the amount of tau in a cerebrospinal fluid sample; comparing the measured amount of tau with a predetermined indicator value of tau; and assessing patient status based on a difference between the measured amounts and predetermined indicator values, wherein a measured amount at or below the Aβ(x-≧41) indicator value and at or above the tau indicator value provides a positive indication in the diagnosis of probable Alzheimer's disease, and wherein a measured amount above the Aβ(x-≧41) indicator value and below the tau indicator value provides a negative indication in the diagnosis of probable Alzheimer's disease.