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The primary outcomes were the occurrence of laboratory hypocalcemia, mean postoperative calcium level, and symptomatic hypocalcemia. The secondary outcomes were the development of permanent hypoparathyroidism and length of hospitalization. Continuous outcomes were represented as standardized mean difference (SMD), and dichotomous outcomes were represented as risk ratio (RR).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Nine trials that enrolled 1079 patients were found eligible. Postoperative laboratory hypocalcemia occurred less in patients who received preoperative calcium and vitamin D, but it was not statistically significant (RR\u2009=\u20090.77, 95% CI: 0.60\u20101.00; <jats:italic>P<\/jats:italic>\u2009=\u2009.05). Mean postoperative calcium level was significantly higher in the intervention group (SMD\u2009=\u20090.10, 95% CI: 0.07\u20100.12; <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.00001). The number of patients with symptomatic hypocalcemia was significantly lower in the intervention group (RR\u2009=\u20090.54, 95% CI: 0.38\u20100.76; <jats:italic>P<\/jats:italic>\u2009=\u2009.0005). There was no significant difference between the 2 groups in cases of permanent hypoparathyroidism and length of hospitalization.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Administration of calcium and vitamin D preoperatively achieves lower rates of postthyroidectomy symptomatic hypocalcemia in comparison with no intervention.<\/jats:p><\/jats:sec>","DOI":"10.1002\/oto2.116","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T07:05:02Z","timestamp":1708067102000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Preoperative Vitamin D and Calcium Administration in Patients Undergoing Thyroidectomy: A Systematic Review and Meta\u2010analysis of Randomized Controlled 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