5th April 2024

Investigations

In addition to checking serum magnesium levels, calcium levels should be taken as often there is hypocalcaemia present. 

Where hypermagnesemia is recurrent or unexplained thyroid function tests and early morning cortisol tests should be performed to investigate Addison’s disease. 

ECG changes in hypermagnesemia include an increased PR interval, broad QRS complexes and Qt prolongation.