Magnesium, Serum

Test Code

CPT Codes
83735

Preferred Specimen

Serum (gold top) tube

Minimum Volume

0.5 mL

Other Acceptable Specimens

Lithium Heparin Plasma (green top) tube

Instructions

This test is for Magnesium measurement on Plasma or Serum. For Magnesium measurement on Body Fluids, order MISMG. For Magnesium measurement on Urine, order URMG.

Transport Container

Serum (gold top) tube or Lithium Heparin Plasma (green top) tube

Transport Temperature

Room Temperature or Refrigeration

Specimen Stability

Room Temperature - 1 week; Refrigerated - 1 week

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Quantity Not Sufficient, EDTA (purple top tube) contamination, IV contamination

Methodology
Potentiometric

Setup Schedule

Daily upon receipt

Report Available

Upon completion of analysis

Reference Range

1.6 - 2.4 mg/dL

Clinical Significance

Magnesium is predominantly an intracellular cation and is essential in enzyme reactions. Magnesium deficiency may cause weakness, tremors, tetany, and convulsions. Hypomagnesemia is associated with hypocalcemia, alcoholism, some types of malnutrition, malabsorption, chronic hemodialysis, and pregnancy. Increased serum magnesium concentrations occur in patients with renal failure, dehydration, and Addison’s disease.

This test is for Magnesium measurement on Plasma or Serum. For Magnesium measurement on Body Fluids, order MISMG. For Magnesium measurement on Urine, order URMG.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.