Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

MAGNESIUM

General Information

Lab Order Codes:

MG

Synonyms:

Mg

CPT Codes:

83735 - Magnesium

Test Includes:

Magnesium concentration in mg/dL.

Logistics

Test Indications:

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.

Lab Testing Sections:

Chemistry

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 hour

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Green top (Li Heparin) preferred
Alternate tube: Red top (plain, no gel) tube

Draw Volume:

0.6 mL blood

Processed Volume:

0.2 mL serum/plasma

Collection:

Routine venipuncture. Mix tubes containing anticoagulant by gentle inversion.

Special Processing:

Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a plastic sample cup. Analyze sample immediately or store at refrigerated temperatures.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimen; gross hemolysis

Interpretive

Reference Range:

Age:

Range (mg/dL)

All ages:

1.5 – 2.5

Critical Values:

<1.2 mg/dL and >6.6 mg/dL

Limitations:

Hemolysis is a cause for sample rejection. Excess bilirubin or lipemia may decrease magnesium values.

Methodology:

Methylthymol blue

References:

MG Flex® reagent cartridge insert sheet Siemens Healthcare Diagnostics (2/4/2010) Version L

Jacobs & DeMott Laboratory Test Handbook Lexi-Comp, Inc (2001) Hudson, OH, 5th Edition

Biorad Liquichek Unassayed Chemistry Control Product Insert

Updates:

2/17/2005: Added >5.5 mEq/L to Critical Values.
12/10/2013: Units change from mEq/L to mg/dL. Note reference range changes.



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