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25041 Magnesium/Creatinine Urine Ratio

Magnesium/Creatinine Urine Ratio
Test Code: MG-CR
Synonyms/Keywords
Magnesium Creatinine ratio​
Test Components
Magnesium and Creatinine give Magnesium/Creatinine ratio​
Useful For
This test is useful in assessing kidney function.​
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Urine, 2nd morning random specimen (collected between 8:00 a.m. and 11:00 a.m.)​ 50 mg sulfamic acid aliquot tube Tube or sage container and acidify with dilute hydrochloric acid to a pH <5 10 mL ​ 5 mL​ 2 mL ​
Collection Processing Instructions
Collect a second morning urine, preferably collected between 8:00 a.m. and 11:00 a.m. Pediatric: For untrained children, collect from 6:00 a.m. - 11:00 a.m.
 
Adjust urine pH to < 5 with sulfamic acid or dilute hydrochloric acid. Acceptable, but not preferred: collect without preservative, keep refrigerated. Acidify upon arrival at lab and prior to analysis.
Specimen Stability Information
Specimen Type Temperature Time
Urine​ Refrigerate​ 2 weeks​
Rejection Criteria
Unpreserved urines
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours Xylidyl Blue Endpoint Assay/ Beckman AU ​
Reference Range Information
Performing Location Reference Range
Marshfield​ Reference ranges have not been established for magnesium in random urine specimens​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
83735​ ​ ​ Magnesium ​
82570​ ​ ​ Creatinine​ ​
Synonyms/Keywords
Magnesium Creatinine ratio​
Test Components
Magnesium and Creatinine give Magnesium/Creatinine ratio​
Ordering Applications
Ordering Application Description
​Centricity ​Magnesium/Creat. Rat
​Cerner ​None
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No​ Urine, 2nd morning random specimen (collected between 8:00 a.m. and 11:00 a.m.)​ 50 mg sulfamic acid aliquot tube Tube or sage container and acidify with dilute hydrochloric acid to a pH <5 10 mL ​ 5 mL​ 2 mL ​
Collection Processing
Collect a second morning urine, preferably collected between 8:00 a.m. and 11:00 a.m. Pediatric: For untrained children, collect from 6:00 a.m. - 11:00 a.m.
 
Adjust urine pH to < 5 with sulfamic acid or dilute hydrochloric acid. Acceptable, but not preferred: collect without preservative, keep refrigerated. Acidify upon arrival at lab and prior to analysis.
Specimen Stability Information
Specimen Type Temperature Time
Urine​ Refrigerate​ 2 weeks​
Rejection Criteria
Unpreserved urines
Useful For
This test is useful in assessing kidney function.​
Test Components
Magnesium and Creatinine give Magnesium/Creatinine ratio​
Reference Range Information
Performing Location Reference Range
Marshfield​ Reference ranges have not been established for magnesium in random urine specimens​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield​ Monday through Sunday​ Less than 2 hours Xylidyl Blue Endpoint Assay/ Beckman AU ​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
83735​ ​ ​ Magnesium ​
82570​ ​ ​ Creatinine​ ​
For most current information refer to the Marshfield Laboratory online reference manual.