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Catalog ID Mg Magnesium (Plasma)

CPOE Test Name

Magnesium Level

Synonyms

Mg

Specimen Type

Plasma

Specimen Requirements

5 mL light green top tube (lithium heparin); light green cap microtainer acceptable; 2 mL blood

Reference Values

1.3 – 2.7 mg/dL

Causes for Rejection

Wrong container; improper labeling; insufficient specimen

Turn Around Time

Urgent/Emergent 1 hour; Routine 2 – 4 hours

CPT / HCPCS Code

83735

Performing Lab

Core Laboratory BI 2023 721-2120; Cancer Center Lab AM 2610 721-1739

Critical Values

≤ 1.2 mg/dL or ≥ 4.0 mg/dL