Evaluating the nutritional status of an orthopaedic patient prior to total joint arthroplasty can offer insight into potential postoperative outcomes.» Laboratory values, such as total lymphocyte count, serum albumin, and serum prealbumin, anthropometric measurements, and screening tools are all important resources in assessing nutritional status.» Using body mass index (BMI) in conjunction with laboratory values and other resources to adequately assess nutritional status can be effective in predicting outcomes after total joint arthroplasty.Disclosure: There was no source of external funding for this study. The Disclosure of Potential Conflicts of Interest forms are provided with the online version of the article (http://links.lww.com/ JBJSREV/A464).