Test Code MG Magnesium LAB103
Test Method
Timed Endpoint Method; Beckman DXC600
Specimen Requirement
0.5 mL serum or plasma is required.
Additional Specimen Collection Information
Collect blood in a lithium heparin, green-top or red-top
tube.
PST and SST (gel tubes) are acceptable. Serum or plasma should
be
separated from contact with the cells within 2 hours of
collection.
Specimens not centrifuged within 4 hours of collection may be
rejected. Refrigerate the specimen if unable to assay within 8
hours of collection. Hemolyzed specimens are not acceptable.
Samples with >2+ lipemia must be cleared prior to analysis.
Reference Values
1.6-3.0 mg/dL
-
Critical Value:
- Low: < 1.0 mg/dL
- High: > 4.0 mg/dL
Performance
Testing is performed Monday through Sunday.
Routine: Typically completed within 4 hours after the
specimen arrives at the testing site.
Expedite: Typically completed within 1 hour after the
specimen arrives at the testing site.
STAT: Typically completed within 30 minutes after the
specimen
arrives at the testing site.
Useful For
Monitoring preeclampsia patients being treated with
magnesium
sulfate, although in most cases monitoring clinical signs
(respiratory rate and deep tendon reflexes) is adequate and
blood
magnesium levels are not required.
LOINC Code Information
19123-9 Magnesium [Mass/Volume] In Serum Or Plasma
CPT Code Information
83735 Chemistry: Magnesium