Vitamin D cannot be used as a global predictor of post-thyroidectomy hypocalcaemia

Area of Science:

• Endocrinology
• Surgical Oncology
• Nutritional Science

Background:

• Post-thyroidectomy hypocalcaemia is a common complication.
• Vitamin D deficiency is prevalent globally and may influence calcium homeostasis.

Purpose of the Study:

• To investigate the association between pre-operative vitamin D levels and the incidence of post-operative hypocalcaemia following total thyroidectomy.
• To determine if pre-operative vitamin D status can serve as a predictive marker for hypocalcaemia after thyroid surgery.

Main Methods:

• Prospective cohort study of 210 patients undergoing total thyroidectomy.
• Measurement of pre-operative serum 25-hydroxy vitamin D.
• Post-operative assessment of calcium, parathyroid hormone, and symptoms.

Main Results:

• No significant association was found between pre-operative vitamin D levels and post-operative hypocalcaemia using univariate and logistic regression analyses (p > 0.05).
• Receiver operating characteristic analysis indicated limited predictive ability of vitamin D for hypocalcaemia (Area Under Curve = 0.6, p = 0.012).

Conclusions:

• Pre-operative vitamin D levels are not a reliable predictor of post-thyroidectomy hypocalcaemia in this population.
• Universal cut-off values for vitamin D are impractical due to population-specific variations in metabolism and assay variability.
• Further research is warranted to establish population-specific vitamin D thresholds for predicting hypocalcaemia risk.