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Test Mnemonic MAGNR Magnesium, Random, Urine

Useful For

Assessing the cause of abnormal serum magnesium concentrations

 

Determining whether nutritional magnesium loads are adequate

 

Calculating urinary calcium oxalate and calcium phosphate supersaturation and assessing kidney stone risk.

Method Name

Colorimetric Endpoint Assay

Reporting Name

Magnesium, Random, U

Specimen Type

Urine


Specimen Required


Collection Container/Tube: Plastic urine container

Submission Container/Tube: Plastic, 5-mL tube (T465) or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 4 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Reference Values

Random Magnesium/Creatinine Ratio: ≥0.035 mg/mg

 

Reference values have not been established for patients <18 years and >83 years of age.

Day(s) and Time(s) Performed

Monday through Sunday; Continuously.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been modified from the manufacturer’s instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

83735

LOINC Code Information

Test ID Test Order Name Order LOINC Value
MAGNR Magnesium, Random, U In Process

 

Result ID Test Result Name Result LOINC Value
MGCO Magnesium, Random, U In Process
CREA7 Creatinine Concentration 2161-8
MCTR Magnesium/Creatinine Ratio In Process