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In order to evaluate the nature and frequency of adverse reactions associated with Therapeutic Apheresis (TA), database information from two large mobile apheresis services was analyzed. A total of 17,940 procedures performed on 3,583 patients were studied using an Access Database. Seventy percent (12,558) of the procedures were performed on a Fresenius AS104 blood cell separator and 30% (5,382) were performed on a COBE Spectra. The five most commonly treated diseases were Guillain-Barre Syndrome (25%), thrombotic thrombocytopenic purpura (20%), myasthenia gravis (18%), the hyperviscosity syndrome (12%), and chronic inflammatory demyelinating polyneuropathy (9%). All patients received calcium gluconate supplement during the procedures. Cardiac monitoring was used during 80% of the procedures and blood pressure monitoring was used during all procedures. All procedures were supervised by a physician. Both apheresis services fully comply with the ASFA Guidelines for Therapeutic Apheresis Providers. Adverse reactions occurred in 3.9% of all procedures. The following adverse reactions were documented: reactions related to ACD toxicity (3%), vasovagal reactions (0.5%), vascular access related complications (0.15%), reactions related to FFP (0.12%), hepatitis B from FFP (0.06%), arrhythmias (0.01%), hemolysis due to inappropriate dilution of 25% albumin (0.01%), and one death (from underlying disease) during a TA procedure (0.006%). These data demonstrate that therapeutic apheresis is associated with a low rate of side effects when performed by well-trained and certified nurses under the direction of experienced physicians, even in the diverse setting of large mobile therapeutic apheresis programs.