Abstract: The present invention provides methods for predicting whether a subject will develop a disease capable of affecting cognitive function. More specifically, the present invention relates to the predictive detection of neurological diseases in a subject. The methods and systems provided enable a quantitative assessment and theoretical predictions of neocortical amyloid loading or amyloid beta levels based on the measurement of biomarkers in biological fluids that will provide an indication of whether a subject is likely to develop a neurological disease, such as Alzheimer's disease (AD).