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Magnesium, Plasma or Serum

Performing Laboratory

Providence Alaska Medical Center

Methodology

Colorimetric (Xylidyl blue)

Note:  If patient’s insurance is Medicare, an Advance Beneficiary Notice of Noncoverage (ABN) may be required. See “Advance Beneficiary Notice of Noncoverage (ABN)” in “Forms” in “Special Instructions.”

Specimen Requirements


Submit only 1 of the following specimens: 
Plasma

Draw blood in a green-top (lithium heparin) tube(s). Spin down, separate plasma from cells, and send 1 mL (minimum volume:  0.3 mL) of lithium heparin plasma refrigerated.  Avoid hemolysis

Note:  1. Indicate plasma on request form.

2. Label specimen appropriately (plasma).

 

Serum

Draw blood in a gold-top serum gel tube(s). Spin down, separate serum from cells, and send 1 mL (minimum volume:  0.3 mL) of serum refrigerated.  Avoid hemolysis

Note:  1. Indicate serum on request form.

2. Label specimen appropriately (serum).

Reference Values

1.8-2.5 mg/dL

Critical values (laboratory will call results)

Pediatrics:  <1.0 mg/dL or >4.4 mg/dL

Adults:  <1.0 mg/dL or >5.0 mg/dL

Stability

Room temp: 8 hours

Refrigerated: 4 days

Frozen: 2 months

Day(s) Test Set Up

Monday through Sunday

Available STAT

Test Classification and CPT Coding

83735

Special Instructions

ETA

Estimated turnaround time 35 min