Background: We compared outcomes of therapeutic plasma exchange (TPE) vs intravenous immunoglobulin (IVIG) among hospitalized patients diagnosed with Guillain-Barré syndrome (GBS).Methods: In a retrospective cohort study of 6642 records (2637 TPE and 4005 IVIG) from the 2002-2014 Nationwide Inpatient Sample, treatment type was examined as predictor of length of stay, total charges, and in-hospital death, with regression modeling using risk adjustment and propensity scoring to control for confounders.Results: Compared with those receiving IVIG, patients who underwent TPE experienced prolonged hospitalization by approximately 7.5 days, greater hospitalization costs by approximately $46,000, and increased in-hospital death with an odds ratio of 2.78. Results did not change after controlling for confounders through risk adjustment, propensity score adjustment, or matching.Conclusions: TPE may be associated with poorer healthcare utilization outcomes vs IVIG, although confounding by indication could not be ascertained. K E Y W O R D S autoimmunity, Guillain-Barré syndrome, healthcare utilization, immunotherapy, intravenous immunoglobulin, therapeutic plasma exchange 1 | INTRODUCTION According to evidence-based guidelines by the American Academy of Neurology, the two recommended treatment options for severely affected Guillain-Barré syndrome (GBS) patients are therapeutic plasma exchange (TPE) and intravenous immunoglobulin (IVIG). 1,2Both treatments were shown to be effective and superior to conservative treatment for disability recovery. 2 Although TPE was shown to be safe and less expensive when administered by experienced physicians, IVIG is preferred by most physicians because of its ease of administration and lower likelihood of complications. 2,3 Nevertheless, it is estimated that approximately 20% of patients with GBS may have severe disability, and 4-15% may die despite close monitoring and administration of immunotherapeutic treatments, including TPE or IVIG. 2,4 Recently published comparative and noncomparative studies of GBS outcomes after treatment with TPE and/or IVIG have consisted primarily of case reports or case series from single institutions in developing countries, at which the choice between TPE and IVIG is largely dependent on economic considerations. 1-23 Given the established equivalence between TPE and IVIG as effective treatments for GBS, it is important to evaluate patient-and hospital-level characteristics that may affect treatment selection. Also, given the acute nature of GBS and the increased morbidity and mortality risks