The present invention features methods of monitoring or detecting a neurological or inflammatory condition in a patient. The method comprises (1) obtaining from the patient a fluid sample from outside of a brain tissue of the patient, wherein the fluid sample contains a circulating phagocyte, and (2) detecting for one or more biomarkers (e.g., a panel of biomarkers) inside the phagocyte, wherein the biomarker is associated with the respective neurological or inflammatory condition.
