EFFECTS OF HYPO- AND HYPERTHYROIDISM ON THE FILTERABILITY OF SERUM MAGNESIUM

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Abstract
The concentrations of total and ultrafilterable magnesium were measured in 16 normal subjects, 18 patients with thyrotoxicosis, and 10 with primary or secondary myxedema. In a small number of patients the measurements were repeated after correction of thyroidal disorders. Anaerobic ultrafiltration of the serum was accomplished by using the Lavietes ultrafiltration unit. The total serum magnesium level of the normal subjects averaged 2.13 mg/100 ml, and the mean concentration of ultrafilterable magnesium was 1.58 mg/100 ml. The latter represented 74.2% (mean value) of the total magnesium content of the serum. The concentrations of total and ultrafilterable magnesium in the serum of the patients with thyrotoxicosis and myxedema did not differ significantly from those of the normal subjects.