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This procedure uses a direct method where magnesium forms a colored complex with xylidyl blue in a strongly basic solution and measured biochromatically at 520/800 nm.

Test Utility

Magnesium levels can be an indicator of many conditions. Low magnesium levels (hypomagnseium) are often associated with diabetes, diuresis, hyperthyroidism, hypoparathyroidism, alcoholism, heart and liver diseases. High levels may be found with renal failure, dehydration, severe diabetic acidosis and Addison’s disease.

Specimen Collection and Preparation

Serum or plasma sample in the following tubes:

  • Serum separator tube (gold or tiger top)

  • Lithium Heparin (green top tube)

Specimen Storage and Stability

Store serum or plasma at the following temperatures:

  • Room Temperature: Not indicated

  • Refrigerated: 2°C to 8°C up to 7 days

  • Frozen: Not indicated

Specimen Rejection

  • Insufficient sample volume

  • Sample not stored at proper temperature

  • Frozen whole blood

  • Severely hemolyzed samples

  • Severely lipemic specimens

  • Specimen labeled incorrectly or not labeled

  • EDTA, oxalate or citrate samples

Reference Pages


Monday – Saturday

Result available within 24 hours of receipt in laboratory

NOTE: Specimens are refrigerated (2-8°) for 7 days before disposal


Vibra Health Laboratory

1307- A, Allen Dr

Troy, MI 48083

(248) 846-0663

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