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Can one really measure magnesium deficiency using the short-term magnesium loading test?
1Medical Department I, Medizinische Universität zu Lübeck, Germany. rob@medinf.mu-luebeck.de
Journal of Internal Medicine
|December 3, 1999
Summary
A new 1-hour magnesium-loading test (MLT) effectively identifies magnesium deficiency in renal transplant patients. This outpatient-friendly test correlates well with bone magnesium levels, aiding in diagnosis.
Area of Science:
- Nephrology
- Biochemistry
- Orthopedics
Background:
- Magnesium deficiency is common in renal transplant recipients.
- Assessing magnesium status is crucial for patient management.
- Standard magnesium-loading tests (MLT) can be time-consuming.
Purpose of the Study:
- To validate a 1-hour outpatient magnesium-loading test (MLT) against the standard 8-hour test.
- To establish the MLT's utility in renal transplant patients prone to magnesium deficiency.
- To correlate femur magnesium concentration with the percentage of magnesium retained during the test.
Main Methods:
- A prospective, randomized, controlled 4-month study comparing a 1-hour MLT with literature data.
- Inclusion of healthy controls, post-renal transplant patients, and hip replacement patients.
- Measurement of serum and urine magnesium via atomic absorption spectroscopy (AAS), and femur magnesium concentration.
Main Results:
- The 1-hour MLT showed comparable results to the standard test in healthy controls.
- Post-renal transplant patients exhibited higher magnesium retention (%Ret) compared to controls.
- Magnesium supplementation significantly reduced %Ret, indicating effective measurement of magnesium status.
Conclusions:
- The 1-hour MLT is a reliable and practical tool for outpatient use.
- The test effectively identifies magnesium deficiency, particularly in renal transplant patients.
- A strong correlation between femur magnesium and %Ret supports the test's accuracy.