Post-bariatric surgery lab tests: are they excessive and redundant?
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and Other Interventional Techniques
2019 SAGES ORAL
Post‑bariatric surgery lab tests: are they excessive and redundant? Terri Menser1,3,4 · Jose Muniz Castro1 · Adriana Lopez3 · Stephen L. Jones1,3 · Bita A. Kash3 · Vadim Sherman1,2 · Nabil Tariq1,2 Received: 9 April 2019 / Accepted: 9 October 2019 © The Author(s) 2019
Abstract Introduction Following bariatric surgery, ongoing postoperative testing is required to measure nutritional deficiencies; the purpose of this study was to quantify the prevalence of these nutritional deficiencies based on two-year follow-up tests at recommended time points. Methods and procedures A retrospective data analysis was conducted of all laboratory tests for bariatric patients who underwent surgery between May 2016 and January 2018 with available lab data (n = 397). Results for nine different nutritional labs were categorized into six recommended postoperative time periods based on time elapsed since the procedure date. Binary variables were created for each laboratory result to calculate descriptive statistics of abnormalities for each lab test over time and used in the individual GEE logistic regression models. Grouped logistic regression examined the total nutritional deficiencies of the nine combined nutrients considering total available labs. Results Multiple lab tests indicated a very low frequency of abnormalities (e.g., Vitamin A, Vitamin B12, Copper, and Folate). Many of the nine included nutritional labs had an average deficiency of less than 10% across all time points. The grouped logistic model found preoperative nutritional deficiency to be predictive of postoperative nutritional deficiency (OR 3.70, p
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