Disorders of sodium balance: Hypothyroidism and hyponatraemia: an old wives' tale?

doi:10.1136/bmj.332.7545.854

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Eric S Kilpatrick, consultant in chemical pathology (Eric.Kilpatrick@hey.nhs.uk)

Hull Royal Infirmary, Hull HU3 2JZ

EDITOR—Like many other sources, Reynolds et al include hypothyroidism as a secondary cause of hyponatraemia.1 However, the evidence supporting this association is extremely poor. Studies in babies with severe congenital hypothyroidism have found no change in …