Test Overview
Test Methodology
Colorimetric (Xylidyl Blue)
Test Usage
To aid in assessing cellular magnesium loss
Reference Range *
50 - 200 mg/24 hrs (5-20 mMol/24 hrs). Random urine collections are reported in units of mg/dL, for which reference values are not established.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
Days Set Up
Daily
Analytic Time
8 hours
Soft Order Code
MAGQ
MiChart Code
Magnesium, 24 HR Urine
Laboratory
Chemical Pathology
Section
Automation
Specimen Requirements
Collection Instructions
Collect 24 hour urine in a clean, plastic container with no metal cap or glued insert and no preservative. Aliquot 5 mL urine into a clean, plastic container with no metal cap or glued insert and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Random urine also acceptable.
Rejection Criteria
Specimens collected with Boric Acid preservative are not acceptable.
Normal Volume
5 mL aliquot of 24 hour urine collection or 2 mL aliquot of random urine collection.
Minimum Volume
2 mL aliquot of 24 hour urine collection or 1 mL aliquot of random urine collection.
Billing
CPT Code
83735
Fee Code
20704
LOINC
MAGU 35250-0 MAGQ 32024-2