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Test Code MG Magnesium, Plasma or Serum

Additional Codes

Ordering Mnemonic


Xylidyl Blue

Performing Laboratory

Holland Hospital Laboratory Services

Specimen Requirements

Collection Container/Tube:

Preferred: Mint-top (lithium heparin)

Specimen Volume: 1.0 mL


Acceptable: Serum gel, Serum non-barrier, Sodium Heparin

Separate from cells within 2 hours of collection

Label as Plasma or Serum




Specimen Transport Temperature


Specimen Stability Information

Temperature Time
Refrigerated (preferred) 48 hours
Frozen Freeze if >48 hours
Ambient 8 hours


Day(s) Test Set Up

Monday through Sunday

Available STAT

Test Classification and CPT Coding

83735 (HH Bill Code 0205174)

Reference Values

1.8-2.5 mg/dL
Critical values (automatic call-back): ≤1.0 mg/dL or ≥6.0 mg/dL