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Magnesium, random urine
|Performed by||Parnassus & Mission Bay Chemistry|
|In House Availability||Test available 24 hours per day 7 days per week|
|Method||Spectrophotometric (calmagite dye)|
|Collection Instructions||Refrigerate sample after collection if transport to laboratory is delayed|
|Container type||Urine cup|
|Amount to Collect||10 mL urine|
|Sample type||Random urine|
|Preferred volume||2 mL urine|
|Min. Volume||1 mL urine|
|Processing notes||Aliquot 2 mL urine and add 1 drop of 6N HCl to acidify.|
|Normal range||See additional information|
|Stability||Refrigerated 2 days|
|Turn around times||Routine 4 hours|
|Additional information||Output varies with the diet.
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.
|CPT coding||82570-90, 83735-90|
|Last Updated||1/28/2015 3:39:39 PM|
|Lab Procedure Link||Click here for Procedure|