Test Code MG Magnesium, Plasma or Serum
Methodology
Colorimetric
Performing Laboratory
Decatur Morgan Hospital-Decatur Campus/Parkway Campus
Specimen Requirements
Submit only 1 of the following specimens:
Plasma
Draw blood in a green-top (lithium heparin) tube(s). Spin down and send 1 mL (pediatric: 0.2 mL) of lithium heparin plasma refrigerated.
Note: 1. Indicate plasma on request
form.
2. Label specimen appropriately (plasma).
Serum
Draw blood in a plain, red-top tube(s), or a serum gel tube(s). Spin down and send 1 mL (pediatric: 0.2 mL) of serum refrigerated.
Note: 1. Indicate serum on request
form.
2. Label specimen appropriately (serum).
Reference Values
1.5-2.7 mg/dL
Critical value (automatic call-back)
Labor and Delivery patient: ≤1.0 mg/dL or ≥6.0 mg/dL
All other patients: ≤1.0 mg/dL or ≥9.0 mg/dL
Test Classification and CPT Coding
83735