Seasonal variation in calcium treatment after thyroidectomy as surrogate for post-operative hypocalcemia: a retrospective register-based national cohort study.

In this cohort, total thyroidectomy performed during August-October was associated with a lower rate of calcium treatment given post-operatively when compared to total thyroidectomy performed during February-April. This would indicate a decreased risk of post-operative hypocalcemia if surgery was carried out after the brighter season.