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Test ID MAGRU Magnesium/Creatinine Ratio, Random, Urine


Specimen Required


Supplies: Aliquot Tube, 5 mL (T465)

Collection Container/Tube: Plastic urine container

Submission Container/Tube: Plastic, 5-mL tube 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.


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.

Profile Information

Test ID Reporting Name Available Separately Always Performed
MCTR1 Magnesium/Creat Ratio, Random, U No Yes
MGCO Magnesium, Random, U No Yes
CRETR Creatinine, Random, U No Yes

Method Name

MGCO: Colorimetric Endpoint Assay

CRETR: Enzymatic Colorimetric Assay

MCTR1: Calculation

Reporting Name

Magnesium/Creat Ratio, Random, U

Specimen Type

Urine

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  72 hours

Reference Values

1 month-<12 months: 0.10-0.48 mg/mg creat

12 months-<24 months: 0.09-0.37 mg/mg creat

24 months-<3 years: 0.07-0.34 mg/mg creat

3 years-<5 years: 0.07-0.29 mg/mg creat

5 years-<7 years: 0.06-0.21 mg/mg creat

7 years-<10 years: 0.05-0.18 mg/mg creat

10 years-<14 years: 0.05-0.15 mg/mg creat

14 years-<18 years: 0.05-0.13 mg/mg creat

18 years-83 years: 0.04-0.12 mg/mg creat

Reference values have not been established for patients who are less than 1 month of age.

Reference values have not been established for patients who are greater than 83 years of age.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved or is exempt by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

83735

82570

LOINC Code Information

Test ID Test Order Name Order LOINC Value
MAGRU Magnesium/Creat Ratio, Random, U 13474-2

 

Result ID Test Result Name Result LOINC Value
CRETR Creatinine, Random, U 2161-8
MGCO Magnesium, Random, U 19124-7
MCTR1 Magnesium/Creat Ratio, Random, U 13474-2

NY State Approved

Yes

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.

Day(s) Performed

Monday through Sunday

Report Available

Same day/3 days