Skip Ribbon Commands
Skip to main content
Sign In
Navigate Up

22687 Magnesium

Magnesium
Test Code: MG
Synonyms/Keywords
Mg, Serum​
Useful For
Determination of magnesium is useful in assessing several diseases and conditions. High magnesium is associated with uremia, dehydration, diabetic acidosis, Addison's disease, and increased medicinal intake of magnesium, such as in the treatment of preeclampsia (hypertension induced by pregnancy). Low magnesium is associated with malabsorption syndrome, acute pancreatitis, hypoparathyroidism, chronic alcoholism and delirium tremens, chronic glomerulonephritis, aldosteronism, digitalis intoxication, and protracted I. V. feeding.​
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​ Plasma​/SerumLithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST)Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)1.0 mL​0.3 mL​0.4 mL whole blood​
Specimen Stability Information
Specimen Type Temperature Time
Plasma​/Serum ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen​ 1 year​
Rejection Criteria
Grossly hemolyzed specimens
Samples collected with EDTA, Potassium Oxalate/Sodium Fluoride ​
Interference
Hemolysis will cause falsely elevated results​
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Chippewa Falls​ ​Monday through Friday ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Weston
 ​Monday through Sunday​ ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Eau Claire Monday through Sunday​​ ​Less than 2 hours​ ​Xylildyl Blue Endpoint Assay/Beckman AU
Park Falls
 ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Ladysmith Medical Center ​​Monday through Sunday ​Less than 2 hours​ ​Xylildyl Blue Endpoint Assay/Beckman AU​
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
Marshfield​ Monday through Sunday​ Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Neillsville​Monday through Sunday​​Less than 2 hours​​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Stevens Point ​Monday through Sunday ​Less than 2 hours Xylildyl Blue Endpoint Assay/Beckman AU ​
​Wisconsin Rapids ​​Monday through Friday ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
Reference Range Information
Performing Location Reference Range
All Performing Sites 1.7 - 2.4 mg/dL
See Critical Value List for list of current critical values​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
83735   ​ ​ ​ ​ ​
Synonyms/Keywords
Mg, Serum​
Ordering Applications
Ordering Application Description
​Centricity ​Magnesium, Blood (MG)
​Cerner ​Magnesium Level
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​ Plasma​/SerumLithium-heparin Plasma Separator (PST)​, Serum Separator Tube (SST)Lithium or Sodium-heparin Green Top (GTT), Red Top Tube (RTT)1.0 mL​0.3 mL​0.4 mL whole blood​
Specimen Stability Information
Specimen Type Temperature Time
Plasma​/Serum ​ ​ Ambient​ 5 days​
Refrigerate​ 7 days​
Frozen​ 1 year​
Rejection Criteria
Grossly hemolyzed specimens
Samples collected with EDTA, Potassium Oxalate/Sodium Fluoride ​
Interference
Hemolysis will cause falsely elevated results​
Useful For
Determination of magnesium is useful in assessing several diseases and conditions. High magnesium is associated with uremia, dehydration, diabetic acidosis, Addison's disease, and increased medicinal intake of magnesium, such as in the treatment of preeclampsia (hypertension induced by pregnancy). Low magnesium is associated with malabsorption syndrome, acute pancreatitis, hypoparathyroidism, chronic alcoholism and delirium tremens, chronic glomerulonephritis, aldosteronism, digitalis intoxication, and protracted I. V. feeding.​
Reference Range Information
Performing Location Reference Range
All Performing Sites 1.7 - 2.4 mg/dL
See Critical Value List for list of current critical values​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Chippewa Falls​ ​Monday through Friday ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Weston
 ​Monday through Sunday​ ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Eau Claire Monday through Sunday​​ ​Less than 2 hours​ ​Xylildyl Blue Endpoint Assay/Beckman AU
Park Falls
 ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Ladysmith Medical Center ​​Monday through Sunday ​Less than 2 hours​ ​Xylildyl Blue Endpoint Assay/Beckman AU​
​Lakeview Medical Center ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
Marshfield​ Monday through Sunday​ Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Minocqua ​Monday through Sunday​ ​Less than 2 hours​ Xylildyl Blue Endpoint Assay/Beckman AU
​Neillsville​Monday through Sunday​​Less than 2 hours​​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
​Stevens Point ​Monday through Sunday ​Less than 2 hours Xylildyl Blue Endpoint Assay/Beckman AU ​
​Wisconsin Rapids ​​Monday through Friday ​Less than 2 hours​ ​Modified Methylthymol Blue (MTB) Complexometric Method/Siemens Dimension
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.