• Jad Zreik, Anshit Goyal, Mohammed Ali Alvi, Brett A Freedman, and Mohamad Bydon.
• Mayo Clinic Neuro-Informatics Laboratory, Department of Neurologic Surgery, Rochester, Minnesota, USA; Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA.
• World Neurosurg. 2020 Apr 1; 136: e398-e406.

BackgroundPreoperative laboratory tests are varied in their administration among physicians, and previous studies have published conflicting reports on their utility. Anterior cervical discectomy and fusion (ACDF) is a commonly performed spine surgery, and patients often undergo preoperative testing. We sought to assess the relationship between preoperative laboratory values and risk for adverse postoperative outcomes after ACDF.MethodsThe American College of Surgeons-National Surgical Quality Improvement Program was queried from 2012 to 2017 to identify patients undergoing elective ACDF. Multivariable logistic regression was performed to assess the association between abnormal laboratory test values and adverse 30-day outcomes. Relative predictor importance was determined using an importance metric defined as Wald χ2 penalized by degrees of freedom.ResultsA total of 47,111 patients were included. On multivariable analysis, high creatinine (P = 0.030), anemia (P < 0.001), hyponatremia (P = 0.034), and leukocytosis (P < 0.001) were found to be significantly associated with any 30-day complications. Anemia (P < 0.001), hypernatremia (P = 0.028), hyponatremia (P = 0.016), and leukocytosis (P < 0.001) were found to be significantly associated with serious 30-day complications. High creatinine (P = 0.027), anemia (P < 0.001), hyponatremia (P = 0.047), and leukocytosis (P = 0.004) were found to be significantly associated with 30-day unplanned readmissions. High blood urea nitrogen (P = 0.007), high creatinine (P = 0.028), anemia (P < 0.001), low platelet count (P < 0.001), hyponatremia (P < 0.001), and leukocytosis (P < 0.001) were found to be significantly associated with nonhome discharge. Predictor importance analysis revealed that abnormal preoperative laboratory values were important determinants in predicting these 30-day outcomes.ConclusionsOur analyses indicate that abnormal preoperative laboratory values are associated with increased risk for adverse outcomes after elective ACDF and can be used in predictive analyses of outcomes.Copyright © 2020 Elsevier Inc. All rights reserved.

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