Magnesium/Creatinine Ration, Urine

Message

Sendout, Mayo test code: MAGRU

Test Code

LAB234006

Alias/See Also

Magnesium, Random, U
MAGRU

CPT Codes
853735, 82570

Preferred Specimen

4 mL random urine collected in a sterile container

Minimum Volume

1 mL

Instructions

1. Collect a random urine specimen.
2. No preservative.

Transport Container

Plastic, 5-mL tube or a clean, plastic aliquot container with no metal cap or glued insert

Transport Temperature

Refrigerated

Specimen Stability

Refrigerated (preferred): 14 days
Frozen: 30 days
Ambient: 72 hours

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability

Methodology
MGCO: Colorimetric Endpoint Assay CRETR: Enzymatic Colorimetric Assay MCTR1: Calculation

FDA Status
Approved

Setup Schedule

Monday through Sunday

Report Available

1-3 days

Limitations

Urinary magnesium excretion must be interpreted with caution during periods of intravenous magnesium infusion.

Reference Range

Included with report

Clinical Significance

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.

Performing Laboratory
Mayo Clinic Laboratories, Rochester, Minnesota

Additional Information
Magnesium/Creatinine Ratio, Random, Urine

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.