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Test Code MG Magnesium, LAB103

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: Green-top (heparin) tube-Hemolyzed specimen is not acceptable.

Acceptable: Gold-top serum gel tube or plain red-top tube
Specimen Volume: 0.1 mL of plasma or serum

Stability: Serum or plasma should be separated from the cells within 2 hours of collection. 

               Specimens may be stored at 2 – 8°C for 7 days and up to 12 months at -20°C or colder.

 

Reference Values

0 - 2 years     1.6 - 2.7 mg/dL

3 - 5 years     1.6 - 2.6 mg/dL

6 - 8 years     1.6 - 2.5 mg/dL

9 - 11 years   1.6 - 2.4 mg/dL

>11 years      1.6 - 2.6 mg/dL

 

Critical values

With magnesium therapy: >8.0 mg/dL

Without magnesium therapy: <1.0 mg/dL or >4.7 mg/dL

Useful For

Magnesium measurements are used in the diagnosis and treatment of hypomagnesemia (magnesium deficiency) and hypermagnesemia (magnesium excess).

Day(s) Test Set Up

Monday through Sunday

Methodology

Colorimetric (Dye-Methylthymol Blue)

Test Classification and CPT Coding

83735