Skip Ribbon Commands
Skip to main content
Sign In
Navigate Up

22688 Magnesium, Urine 24 hr

Magnesium, Urine 24 hr
Test Code: MG-24H
Synonyms/Keywords
Urine Magnesium​
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,
24 hour​
 24 hr urine jug with 7.0 g sulfamic acid​
24 hr urine jug with 20 mL 6N HCL
or 25 mL 33% acetic acid
​
 10 aliquot of a well mixed 24 hr urine​ 5 mL aliquot​ 2 mL aliquot​
Collection Processing Instructions
Indicate collection dates and times.  Total volume must be measured, recorded and included with the test request.
If uric acid is also ordered, no preservative is needed, but keep specimen refrigerated during patient collection as well as during transport to receiving facility.  Prepare 2 aliquots, adjusting pH of magnesium aliquot to 5 or less (using 6N hydrochloric acid.  Adjust the pH of the second (uric acid) aliquot to 7.5-8.5 using 20% sodium hydroxide.  Alternately, use Marshfield preservative containing aliquot tubes which provide automatic pH adjustment.  **See "Aliquotting of 24 hr Urines for Multiple Tests".​
 
After measuring the total volume, create an aliquot and send the remaining urine in the collection jug to Marshfield; send both the aliquot and remaining urine in the collection jug.
 
If a location is not able to measure the total volume, send the urine collection jug without making an aliquot.
Specimen Stability Information
Specimen Type Temperature Time
Urine​ Refrigerate​ 2 weeks​
Rejection Criteria
​Specimens without preservative during collection (refrigeration or acid preservative)
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​

Male: 42 - 182 mg/24 hours

Female: 43 - 155 mg/24 hours​

Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
83735​ ​ ​ ​ ​
Synonyms/Keywords
Urine Magnesium​
Ordering Applications
Ordering Application Description
​Centricity ​Magnesium, 24hr
​Cerner ​Magnesium Level 24 Hour Urine
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,
24 hour​
 24 hr urine jug with 7.0 g sulfamic acid​
24 hr urine jug with 20 mL 6N HCL
or 25 mL 33% acetic acid
​
 10 aliquot of a well mixed 24 hr urine​ 5 mL aliquot​ 2 mL aliquot​
Collection Processing
Indicate collection dates and times.  Total volume must be measured, recorded and included with the test request.
If uric acid is also ordered, no preservative is needed, but keep specimen refrigerated during patient collection as well as during transport to receiving facility.  Prepare 2 aliquots, adjusting pH of magnesium aliquot to 5 or less (using 6N hydrochloric acid.  Adjust the pH of the second (uric acid) aliquot to 7.5-8.5 using 20% sodium hydroxide.  Alternately, use Marshfield preservative containing aliquot tubes which provide automatic pH adjustment.  **See "Aliquotting of 24 hr Urines for Multiple Tests".​
 
After measuring the total volume, create an aliquot and send the remaining urine in the collection jug to Marshfield; send both the aliquot and remaining urine in the collection jug.
 
If a location is not able to measure the total volume, send the urine collection jug without making an aliquot.
Specimen Stability Information
Specimen Type Temperature Time
Urine​ Refrigerate​ 2 weeks​
Rejection Criteria
​Specimens without preservative during collection (refrigeration or acid preservative)
Useful For
This test is useful in assessing kidney function​
Reference Range Information
Performing Location Reference Range
Marshfield​

Male: 42 - 182 mg/24 hours

Female: 43 - 155 mg/24 hours​

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​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.