Alzheimer's disease (AD) is affecting aging populations worldwide at an alarming rate, with over 46.8 million cases estimated currently. As the population ages, this number is projected to increase substantially by 2050 unless effective interventions are developed and implemented. Efforts are needed to identify reliable biomarkers for early detection of AD. Proposed AD biomarkers include detecting pathophysiological processes in the brain using new imaging techniques and novel PET ligands, as well as measuring levels of hyperphosphorylated tau and low Aβ peptide in cerebrospinal fluid. New biomarkers are also being developed to detect various pathological processes like neuroinflammation, synaptic dysfunction, metabolic impairment, protein aggregation and neurodegeneration. Highly specific and sensitive blood biomarkers using