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Test Code MGOB Magnesium for OB, LAB3098

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: A minimum sample volume of 2.4 µL plus a dead volume

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

               Specimens may be stored at 2 – 25°C for 7 days and up to 12 months at -20°C or colder.

Reference Values

Serum/Plasma

Therapeutic Range (mg/dL)

Critical Low

(mg/dL)

Critical High

(mg/dL)

Therapeutic Range

5.0 - 9.0

1.0

>9.0

 

Day(s) Test Set Up

Monday through Sunday

Useful For

Monitoring magnesium in pregnant patients who are receiving magnesium therapy is important to ensure the patient is in a terapeutic range.  Magnesium is used for maternal hypertension, neuroprotection for the fetus, and to stop preterm labor.

Methodology

Colorimetric endpoint method

Test Classification and CPT Coding

83735

Report Available

STAT within 1 hour of receipt.

Routine within 2 hours of receipt.

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