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Order Code CH165
Turnaround Time 24 hours
Test Includes


Specimen Requirements
Specimen Source
Serum, Plasma
Transport Container
(Specimen Container)

SST (Tiger Top), Lithium Heparin/ Sodium Heparin

Preferred Specimens
Minimum Volume (uL)
.5 mL
Collection Instructions
(Transport Temperature)
Transport Refrigerated (cold packs)
Specimen Stability
Temperature Period
Room temperature 7 days
Refrigerated 7 days
Frozen > 1 year
Test Details
Clinical Significance

The Alinity c Magnesium assay is used for the quantitation of magnesium in human serum, plasma, or urine on the Alinity c analyzer. Magnesium measurements are used in the diagnosis and treatment of hypomagnesemia (abnormally low plasma levels of magnesium) and hypermagnesemia (abnormally high plasma levels of magnesium). Magnesium is an essential nutrient which is involved in many biochemical functions. It has a structural role in nucleic acids and ribosomal particles, is required as an activator for many enzymes, and has a role in energy producing oxidative phosphorylation.

The normal body contains 21 to 28 g magnesium, more than 50% of which is complexed with calcium and phosphate in bone. Only approximately 1% of the total magnesium is found in the extracellular fluid. It tends to enter and leave cells under the same conditions as potassium. Approximately 35% of plasma magnesium is protein-bound, mainly to albumin, and therefore changes in albumin concentration may affect magnesium. Hypomagnesemia results in impairment of neuromuscular function, carbohydrate intolerance, and cardiac arrhythmias. Hypermagnesemia results in hypotension, bradycardia, and respiratory depression, among other conditions.

Reference Ranges

1.8 – 2.5 mg/dL

Alternative Names