Magnesium
Order Code: MG
Epic Lab Code: LAB103
Order Form: A-1a General Lab or Epic Req
Chemistry
6240 RCP
356-3527
Specimen:
Plasma
Collection Medium:
Plasma Separator Tube
Alternate Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
3 mL whole blood in light green top tube or ONE microtainer for pediatric patients.
Rejection Criteria:
Avoid hemolysis
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
1.5-2.9 mg/dL Critical value: <1.0 mg/dL and >4.7 mg/dL
Test Limitations:
Criterion: Recovery within plus or minus 10% of initial values. Plasma Icterus: No significant interference up to an I index of 65 (conjugated bilirubin) and an I index of 45 (unconjugated bilirubin) corresponding to an approximate bilirubin concentration of 65 mg/dL (conjugated) and 45 mg/dL (unconjugated). Hemolysis interferes due to magnesium released from erythrocytes. Lipemia (Intralipid): No significant interference up to an L index of 400 (approximate triglycerides concentration: 800 mg/dL). There is poor correlation between turbidity and triglycerides concentration. In-vitro tests were performed on 34 commonly used pharmaceuticals. No interference with the assay was found. Reference: Glick MR, Ryder KW, Jackson SA. Graphical Comparisons of Interferences in Clinical Chemistry Instrumentation. Clin Chem 1986;32:470-474.
Methodology:
Colormetric endpoint
CPT Code:
83735
 
See also:
Magnesium-Other, Body Fluid (e.g., surgical drain, pericardial, peritoneal, peritoneal dialysis, pleural, or synovial)
 
See Additional Information:
Chemistry Critical Lab Values