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Test Code MG Magnesium, LAB103

Methodology

Colorimetric (Dye-Methylthymol Blue)

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

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

83735

Useful For

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