Turnaround Time: 2 - 4 days
CPT Code:


Test Type: 1 mL Red blood cells (RBCs)
Stability Time:



Room temperature

14 days


14 days

Reference Range:

4.2-6.8 mg/dL


Evaluate magnesium deficiency.

This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.

Collection Details:

Collection Instructions:

Green-top (heparin) tube, lavender-top (EDTA) tube, royal blue-top (EDTA) tube, or tan-top lead-free tube.

Centrifuge tube as soon as possible and separate plasma from cells. Discard the plasma. Using the original collection tube, submit only the RBCs to the laboratory.

Room temperature.