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Magnesium CPT: 83735

Expected Turnaround Time

Within 1 day

Specimen Requirements

Specimen

Serum (preferred) or plasma.

Volume

1 mL

Minimum Volume

0.5 mL

Container

Red-top tube, gel-barrier tube, or green-top (lithium heparin) tube.

Collection

Separate serum or plasma from cells within 45 minutes of collection.

Storage Instructions

Maintain specimen at room temperature.

Stability Requirements

Temperature Period
Room Temperature 14 days
Refrigerated 14 days
Frozen 14 days
Freeze/thaw/ cycles Stable x 3

Patient Information

To evaluate the level of magnesium in your blood and to help determine the cause of abnormal levels of magnesium, calcium and/or potassium.

When you have symptoms such as weakness, irritability, cardiac arrhythmia, nausea, and/or diarrhea that may be due to too much or too little magnesium; when you have abnormal calcium or potassium levels; when magnesium is given for medical treatment.

A blood sample drawn from a vein in your arm; sometimes a timed urine collection that most often requires a 24-hour sample collection.

For a blood sample, overnight fasting may be required; follow any instructions that you are given.