This invention teaches a method of targeted apheresis that can be used to treat a variety of different diseases including infectious diseases, autoimmune disorders, and reducing circulating biomarkers associated with certain disorders e.g. pre-eclampsia. This invention discloses the use of apheresis membranes as the support matrix upon which one or more different binding agents (e.g. antibodies, aptamers, binding peptides, soluble receptors), and/or ligands (e.g. antigens, serum proteins, hormones, cytokines and cell markers) are attached. During targeted apheresis the patient's blood will come into contact with one or more of these immobilized binding agents or ligands and any targeted harmful factor in the blood will be bound out of circulation. The cleaned blood is then returned to the patient. Reducing the concentration of the harmful substance in blood will alleviate the symptoms of the disease.
