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Magnesium, Serum / Plasma
|Test Update Information||Effective 11/27/12, the magnesium reagent has been restandardized to the NIST standard 956 L1 causing results to decrease by 0.1 mg/dL|
|Performed by||Parnassus & Mt. Zion Chemistry|
|In House Availability||Test available 24 hours per day 7 days per week|
|Method||Spectrophotometric (calmagite dye)|
|Container type||Gold top or Light Green top|
|Amount to Collect||1 mL blood Click here for Microdetermination info|
|Sample type||Serum or plasma|
|Preferred volume||0.5 mL serum or plasma|
|Min. Volume||0.2 mL serum or plasma Click here for Microdetermination info|
|Normal range||1.8 - 2.4 mg/dL
Normal range was determined by testing 271 male and female adult healthy blood donors at UCSF. Pediatric patients will use adult range due to comparable ranges between UCSF's normal study and Soldin, Steven J. Pediatric Reference Intervals, 6th edition, AACC Press, 2007.
|Stability||Room temperature 8 hours, refrigerated 2 days, frozen at -20C 1 week|
|Turn around times||STAT 1 hour, Routine 4 hours|
|Additional information||To convert mg/dL to mmol/L (SI units) multiply by x 0.411.
Severely lipemic samples will be treated and reassayed. Hemolysis may artifactually increase the result.
Gadolinium MR contrast agents including Gadodiamide (Omniscan), Gadoversetamide (Optimark), Gadopentetate Dimeglumine (Magnevist), and Gadoterdiol (Prohance), have been shown to interfere with certain colorimetric assays used in the measurement of various serum cations including iron,
magnesium, and calcium. The UCSF clinical labs utilize a colorimetric assay for the measurement of both serum iron and serum magnesium that are subject to this interference. For serum magnesium, some gadolinium containing agents (Gadodiamide and Gadoversetamide) may produce a falsely elevated result (on average 117 and 124% respectively, of the true serum magnesium
concentration). See "Calcium" and "Iron" entries for respective interferences.
Reference:Proctor et al. Gadolinium Magnetic Resonance contrast Agents produce Analytic Interference in Multiple Serum Assays. Am J Clin Pathol. 2004;121:282-292.
|Medical Necessity?||Yes. Click here for more information|
|Last Updated||12/3/2012 3:28:37 PM|
|Lab Procedure Link||Click here for Procedure|