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HelpTest Code LAB103 Magnesium, Plasma
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Methodology
Colorimetric (Xylidyl Blue)
Literature References:
Package insert: Magnesium MG2 reagent. Roche Corporation, 03/2015.
Specimen Requirements
Specimen Type: Plasma
Container/Tube: Mint-green top (lithium heparin)
Specimen Volume: Full tube
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
1.4-2.5 mg/dL
Critical result (automatic call-back):
Non-labor and delivery patients: ≤0.9 mg/dL or ≥4.8 mg/dL
Labor and delivery patients: ≤0.9 mg/dL or ≥7.3 mg/dL
Literature Reference:
1. Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6th 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
Alternate Tube:
1 dark green-top (lithium heparin) tube
1 red-top tube
Laboratory Processing Instructions:
Test performed in BJH Core Lab. Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.
Test performed in South County Siteman and Ambulatory Cancer Building Lab. Centrifuge sample and deliver to the Cobas. Completed specimens are stored refrigerated for 5 days.
Special Instructions
See Analyte Stability Chart under General Information for a complete list.
LOINC Code Information
| Name | LOINC Code |
| Magnesium | 19123-9 |