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- W2038484857 abstract "Abstract In serum, magnesium exists in three fractions: protein-bound, complex-bound and free ionized form. Only the free ionized fraction is biologically active. Until recently, only the measurement of serum total magnesium has been in clinical use. Now, commercially available instruments using new ion-selective electrodes for Mg ++ have made possible the reliable measurement of serum ionized magnesium in clinical practice. For the measurement of serum ionized magnesium we used a magnesium-selective electrode installed in a six-channel electrolyte analyzer. We compared the use of ionized versus total magnesium measurement in 52 patients with intestinal disease, 54 with liver disease, and in 75 healthy control subjects. In the patients with alcoholic liver disease both serum ionized and total magnesium were lower, and in those with inflammatory bowel disease slightly higher than in control subjects. The correlation coefficient between serum ionized and total magnesium was r=0.87 (p<0.001) in the patients, and r=0.75 (p<0.001) in the controls. In the patient group the fraction of ionized magnesium in the total was negatively related to the serum albumin level (r=−0.41, p<0.001). Serum total magnesium was below the reference range in 30 out of 150 measurements, serum ionized magnesium in only 9 out of 150 measurements, respectively. Thus, 21 cases with low total but normal ionized magnesium (two thirds of hypomagnesemia according to serum total magnesium) were false positive. Total magnesium measurement may overestimate the incidence of hypomagnesemia when significant hypoalbuminemia is present. Measurement of serum ionized magnesium instead of total magnesium may therefore be of advantage in evaluating patients with hypoalbuminemia and when hypomagnesemia is expected." @default.
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- W2038484857 date "1998-09-01" @default.
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- W2038484857 title "Serum Ionized versus Total Magnesium in Patients with Intestinal or Liver Disease" @default.
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- W2038484857 doi "https://doi.org/10.1515/cclm.1998.126" @default.
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