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Lab Dept:
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Chemistry
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Test Name:
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MAGNESIUM
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General Information
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Lab Order Codes:
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MG
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Synonyms:
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Mg
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CPT Codes:
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83735 - Magnesium
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Test Includes:
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Magnesium concentration in mEq/L
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Logistics
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Test Indications:
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Useful for evaluating magnesium and electrolyte status. Magnesium is the fifth most abundant cation in the body and is second only to potassium within cells. Magnesium deficiencies are related to impairment of neuromuscular function, cardiovascular disease and hypertension.
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Lab Testing Sections:
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Chemistry
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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4 hours
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Blood
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Container:
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Green top (Li Heparin) preferred
Alternate tube: Red top (plain, no gel) tube
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Draw Volume:
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0.6 mL blood
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Processed Volume:
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0.2 mL serum/plasma
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Collection:
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Routine venipuncture. Mix tubes containing anticoagulant by gentle inversion.
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a plastic sample cup. Analyze sample immediately or store at refrigerated temperatures.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimen; gross hemolysis
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Interpretive
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Reference Range:
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Age:
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Range (mEq/L)
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0 – 2 years:
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1.5 – 2.1
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2 – 4 years:
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1.3 – 2.3
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4 – 8 years:
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1.3 – 2.1
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8 – 14 years:
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1.2 – 2.0
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>14 years
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1.3 – 2.1
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Critical Values:
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<1.0 mEq/L and >5.5 mEq/L
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Limitations:
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Hemolysis is a cause for sample rejection. Excess bilirubin or lipemia may decrease magnesium values.
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Methodology:
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Methylthymol blue
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References:
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MG Flex® reagent cartridge insert sheet Siemens Healthcare Diagnostics
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Jacobs & DeMott Laboratory Test Handbook Lexi-Comp, Inc (2001) Hudson, OH, 5th Edition
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Biorad Liquichek Unassayed Chemistry Control Product Insert
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Updates:
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2/17/2005: Added >5.5 mEq/L to Critical Values.
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