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Related Experiment Videos

The magnesium load test: experience in elderly subjects.

B J Martin1

  • 1Department of Geriatric Medicine, Glasgow Royal Infirmary Group, Lightburn Hospital, Scotland, U.K.

Aging (Milan, Italy)
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

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The magnesium load test can assess whole body magnesium status in older adults. Serum magnesium levels may appear normal despite tissue depletion, highlighting the test

Area of Science:

  • Geriatric Medicine
  • Nutritional Biochemistry
  • Clinical Chemistry

Background:

  • Serum magnesium is a common but potentially inaccurate measure of magnesium status.
  • Tissue depletion can occur despite normal serum magnesium levels.
  • Limited data exists on the magnesium load test in older populations.

Purpose of the Study:

  • Establish reference ranges for the magnesium load test in elderly subjects.
  • Improve interpretation of magnesium status in older adults with normal serum magnesium.
  • Investigate magnesium retention in elderly individuals with potential tissue depletion.

Main Methods:

  • Administered intravenous magnesium sulfate (0.25 mmol/kg) to 43 elderly female subjects (average age 83).
  • Collected 24-hour urine magnesium for three days, including the test day.

Related Experiment Videos

  • Analyzed serum magnesium, urine magnesium, and creatinine clearance.

    • Main Results:

    • Average magnesium retention was 62% (range 15-98%) in 30 subjects completing the test.
    • Serum magnesium was a better indicator of tissue status than urine magnesium.
    • Creatinine clearance showed a stronger correlation with magnesium retention than serum or urine magnesium.

    Conclusions:

    • The magnesium load test is feasible in older adults, though challenging to complete.
    • Creatinine clearance may aid in interpreting magnesium retention in this population.
    • Further research is needed to refine the magnesium load test for elderly individuals.