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HelpTest Code LAB405 Magnesium, Urine, Random
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Methodology
Colorimetric (Xylidyl Blue)
Literature Reference:
Package insert: Magnesium MG2 reagent. Roche Corporation, 03/2022.
Specimen Requirements
Specimen Type: Urine, random
Container/Tube: Urine Complete Cup Kit
Specimen Volume: 10 mL
Collection Instructions: No additive.
Additional Information: See Urine Collection information under General Information
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory
Test Classification and CPT Coding
83735
Reference Values
No established reference intervals
Literature Reference:
1. Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 64, p. 1422, Elsevier, St. Louis, MO 2018.
2. Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 69, p. 1655, Elsevier, St. Louis, MO 2018.
Specimen Transport Temperature
Ambient
Additional Information
For BJH Laboratory Use Only
Specimen must be kept refrigerated before delivery to limit bacterial growth.
Laboratory Processing Instructions:
Test performed in BJH Core lab. Mix urine well. Using 13x100 test tubes, prepare a 7-mL save-tube and refrigerate. The urine specimen must have a pH between 2.0 and 4.5. If the pH is not within these limits, the pH must be adjusted with 6N HCl. Carefully add 6N HCl to the entire collection in 1 drop increments. After pH adjustment, the specimen should then be mixed well again. Heat for 10 minutes at 56° C. Deliver to the automated line for centrifugation and delivery to Cobas 8000 for analysis. Completed specimen is stored refrigerated for 5 days.
Special Instructions
See Urine Collection information under General Information.
See Analyte Stability Chart under General Information for a complete list.
LOINC Code Information
| Name | LOINC Code |
| Magnesium in urine | 19124-7 |