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Test Code MG Magnesium, Serum or Plasma

Performing Laboratory

Huntsville Hospital Laboratory/Madison Hospital Laboratory

Methodology

Xylidyl Blue

Specimen Requirements

Container/Tube:

Preferred: Lithium heparin (light green-top)

Acceptable: Serum Gel

 Draw blood, spin down and send 1 mL (pediatric:  0.2 mL) of plasma or serum.

Specimen Stability Information

 

Specimen Type

Temperature

Time

Plasma,lithium heparin / Serum

RT, spun

7 days
 

Refrigerated, spun

7 days

 

Reject Due To

 

Hemolysis

Mild:

ok

Gross:

ok

Lipemia

Mild:

ok

Gross:

ok

Icterus

Mild:

ok

Gross:

ok

 

Reference Values

1.6-2.5 mg/dL
Therapeutic: 4.8-8.4 mg/dL

 

Critical values:

  <1.0 mg/dL or >4.7 mg/dL

  >8.4 mg/dL (labor and delivery patient)

Day(s) Test Set Up

Monday through Sunday

CPT Coding

83735

LOINC Coding

Test name LOINC Code

Magnesium, Serum or Plasma

19123-9