MAGNESIUM, SERUM

Test Code

MG (OE & LAB)

CPT Codes
83735

Preferred Specimen

Gold Tube (SST)

Patient Preparation
None

Minimum Volume

1 mL

Other Acceptable Specimens

Green Tube (Lithium Heparin)

Instructions

Centrifuge for complete separation of serum or plasma from red cells.

Transport Container

GOLD Tube

Transport Temperature

Room temperature

Specimen Stability

2-8°C up to 7 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross Hemolysis

Methodology
Xylidyl Blue

Setup Schedule

DAILY, as received

Report Available

STAT: <60 minutes
Routine: <4 hours

Reference Range

Male/Female Ages >=0 Days - <5 Months: Normal Range: 1.7-2.3 mg/dL Critical Low : <=1.1 mg/dL Critical High : >=4.7 mg/dL Male/Female Ages >=5 Months - <6 Years: Normal Range: 1.7-2.3 mg/dL Critical Low : <=1.1 mg/dL Critical High : >=4.7 mg/dL Male/Female Ages >=6 Years - <12 Years: Normal Range: 1.7-2.1 mg/dL Critical Low : <=1.1 mg/dL Critical High : >=4.7 mg/dL Male/Female Ages >=12 Years - <20 Years: Normal Range: 1.7-2.2 mg/dL Critical Low : <=1.1 mg/dL Critical High : >=4.7 mg/dL Male/Female Ages >=20 Years: Normal Range: 1.6-2.5 mg/dL Critical Low : <=1.1 mg/dL Critical High : >=4.7 mg/dL
Reference ranges may vary based on performing lab. Use lab reports when interpreting patient results.

Clinical Significance

Magnesium serves as an activator for a number of enzyme systems engaged in the transfer and hydrolysis of phosphate groups such as hexokinase, alkaline phosphatase, prostatic acid phosphatase, and creatinine kinase.

Decreased serum magnesium levels have been observed in cases of diabetes, alcoholism, diuresis, hyperthyroidism, hypoparathyroidism, malabsorption, hyperalimentation, myocardial infarction, congestive heart failure, and liver cirrhosis.

Increased serum magnesium levels have been found in cases of renal failure, dehydration, severe diabetic acidosis, and Addison's Disease.

Performing Laboratory
Mount Sinai Hospital
Holy Cross Hospital

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.