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Test Code MG Magnesium, Plasma or Serum

Performing Laboratory

MaineGeneral Medical Center

Reference Values

1.6-2.6  mg/dL

Critical values (automatic call-back):  <1.0 mg/dL or >4.5 mg/dL

Day(s) Test Performed

Monday - Sunday

Specimen Requirements

Submit only 1 of the following specimens:

Preferred:

Plasma

Draw blood in a green-top (lithium heparin) tube. For pediatric specimenS, draw blood in a green-top (lithium heparin) MICROTAINER(S)®. Label specimen with patient’s name (first and last), date of birth, date and time of draw, phlebotomist’s initials and as plasma. Spin down and send 1 mL of lithium heparin plasma refrigerated.

 

Alternate:

Serum

Draw blood in a gold-top (serum separator) gel tube. Label specimen with patient’s name (first and last), date of birth, date and time of draw, phlebotomist’s initials and as serum. Spin down and send 1 mL of serum refrigerated.

 

Specimen stability:

Sample may be stored at 2-8C for up to seven (7) days. Freeze for longer storage.

 

Minimum volume:

500 µL

 

Specimen rejection criteria:

Hemolyzed specimens are not acceptable.

 

Test Classification and CPT Coding

83735

Methodology

Colorimetric