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Magnesium

Magnesium

Alternate Test Name

MG

Epic Mnemonic
Sunquest Mnemonic

LAB103
MG

Category

Chemistry

Methodology

Colorimetric

Test Performance Schedule

Sunday - Saturday

Result Availability

Within 24 hours – STAT upon request

Specimen Required

Container

Gold top (SST), Red top (serum), or Green top (lithium heparin) tube

Volume

Pref. Vol.: 1.0 mL serum or plasma
Min. Vol.: 0.5 mL serum or plasma

Collection Instructions

• Routine venipuncture

• Immediately after collection, gently invert tube 5-10 times

• Clot 30 minutes

• Promptly centrifuge 10 minutes

• If no gel barrier is present immediately transfer serum or plasma to a plastic tube and refrigerate

• Properly centrifuged gel barrier tube does not require transfer of serum or plasma to separate tube

Transportation Instructions

Refrigerated

Stability

• Room Temperature: 5 days
• Refrigerated: 5 days

Causes for Rejection

Hemolysis

Remarks

Medicare Medical Necessity Policy

CPT Codes

83735

Effective/Revised

03/28/2017

Clinical Significance

Magnesium along with potassium is a major intracellular cation. Magnesium is a cofactor of many enzyme systems. Regulation of magnesium takes place mainly via the kidneys, especially via the ascending loop of Henle.

 

Numerous studies have shown a correlation between magnesium deficiency and changes in calcium-, potassium- and phosphate-homeostasis which are associated with cardiac disorders such as ventricular arrhythmias that cannot be treated by conventional therapy, increased sensitivity to digoxin, coronary artery spasms, and sudden death. Additional concurrent symptoms include neuromuscular and neuropsychiatric disorders.

 

Hypermagnesemia is found in acute and chronic renal failure, magnesium excess, and magnesium release from the intracellular space.

 

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