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Laboratory Medicine

Test catalogue

Magnesium (Mg)

Test Name

Magnesium (Mg)

Gold Tube Specimen Type / Requirements

Container Type = 1 Gold Top (SST)

Minimum Volume = 1 ml serum

Tube must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Serum or heparinized plasma collected with or without gel separator. Write your initials, date and time of collection on the collection label or requisition.

Special Instructions Separate serum or plasma from cells within 2 hours of collection

Rejection Criteria: Gross hemolysis, Unlabeled or Not Sufficient Quantity samples will be rejected.

Stability:Stable for 1 week separated from cells at room temperature, refrigerated for 1 week and frozen -15 to -20°C for 1 year.

Transportation:Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

1 hour for Trauma / Stat - 2 hours for routine

Test Utilization

Routine

Reference Value

Adult: 0.63 – 0.94 mmol/L

0 – 1 Week: 0.85 – 0.95 mmol/L

Critical Intervals

< 0.40 mmol/L and > 2.50 mmol/L

Test Code

MG

Methodology

Spectrophotometric (Colorimetric; Endpoint method)

Testing Location

SMH-Biochemistry

Other Information