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Mayo Clinic Laboratories

Test Code MG Magnesium, Plasma or Serum

Additional Codes

LAB103

Methodology

Useful for identification of malabsorptive disorders, pancreatitis, abnormalities associated with renal clearance, drug therapy, and for monitoring treatment of toxemia of pregnancy.

Performing Laboratory

St. Mary's Regional Medical Center-Chemistry

 

CPT: 83735

Specimen Requirements

Submit only 1 of the following specimens:

 

Plasma

Container/Tube: Light green-top (lithium heparin) tube

Specimen: 1 mL of lithium heparin plasma

Transport Temperature: Ambient

Collection Instructions: Hemolyzed or grossly lipemic specimen may yield elevated results.

Note: 1. Indicate plasma.
2. Label specimen appropriately (plasma).

 

Serum

Container/Tube: Plain, red-top tube or serum gel tube

Specimen: 1 mL of serum

Transport Temperature: Ambient

Collection Instructions: Hemolyzed or grossly lipemic specimen may yield elevated results.

Note: 1. Indicate serum on request form.
2. Label specimen appropriately (serum).

Reference Values

Males and females

 

>12 years: 1.6-2.6 mg/dL

 

Call criteria (automatic call-back): <1.0 mg/dL or >5.0 mg/dL

Day(s) Test Set Up

Monday through Sunday

Available STAT