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25102 Magnesium, RBC (64612)

Magnesium, RBC (64612)
Test Code: MGRBCSO
Synonyms/Keywords
​Intracellular Magnesium
Useful For

​Evaluate magnesium stores

Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Plasma AND Packed Red Blood Cells​
Metal-free Royal Blue Top Tube with EDTA (RBTT)
​		 ​

2 mL Plasma

2 mL Packed RBCs​

​0.5 mL Plasma

0.5 mL Packed RBCs

 ​
Collection Processing Instructions

​Collect whole blood in a  Metal-free Royal Blue Top Tube with EDTA (RBTT).

Both packed red blood cells and plasma are required.  Spin down and separate plasma and red blood cells immediately.  Transfer 2 mL plasma and 2 mL packed red blood cells into separate metal-free tubes.  Failure to separate plasma from cells may cause rejection due to hemolysis of red cells and contamination of the plasma.  Specimen must be received at Medtox within 5 days of collection. 

NOTE: Both plasma and packed red blood cells are required for testing.

Refrigerate; must be received at Medtox within 5 days.

Specimen Stability Information
Specimen Type Temperature Time
​Packed Red Blood Cells AND Plasma ​Refrigerate ​5 days
Rejection Criteria
Not receiving both plasma and packed red blood cells Reject
​Refrigerated samples older than 5 days ​Reject
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​3 days
Inductively Coupled Plasma/Mass Spectrometry (ICP-MS)
Reference Lab
Medtox Laboratories
Test Information
 RBC magnesium results reflect the intracellular stores and general homeostasis of magnesium. Results may be falsely low if RBCs in the submitted specimen are lysed or not promptly separated from plasma.​
Reference Range Information
Performing Location Reference Range
Medtox Laboratories​ 3.5 - 7.1 mg/dL​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​83735 ​ ​ ​ ​
Synonyms/Keywords
​Intracellular Magnesium
Ordering Applications
Ordering Application Description
​Centricity ​Magnesium, RBC (64610)
​Cerner None​
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Plasma AND Packed Red Blood Cells​
Metal-free Royal Blue Top Tube with EDTA (RBTT)
​		 ​

2 mL Plasma

2 mL Packed RBCs​

​0.5 mL Plasma

0.5 mL Packed RBCs

 ​
Collection Processing

​Collect whole blood in a  Metal-free Royal Blue Top Tube with EDTA (RBTT).

Both packed red blood cells and plasma are required.  Spin down and separate plasma and red blood cells immediately.  Transfer 2 mL plasma and 2 mL packed red blood cells into separate metal-free tubes.  Failure to separate plasma from cells may cause rejection due to hemolysis of red cells and contamination of the plasma.  Specimen must be received at Medtox within 5 days of collection. 

NOTE: Both plasma and packed red blood cells are required for testing.

Refrigerate; must be received at Medtox within 5 days.

Specimen Stability Information
Specimen Type Temperature Time
​Packed Red Blood Cells AND Plasma ​Refrigerate ​5 days
Rejection Criteria
Not receiving both plasma and packed red blood cells Reject
​Refrigerated samples older than 5 days ​Reject
Useful For

​Evaluate magnesium stores

Reference Range Information
Performing Location Reference Range
Medtox Laboratories​ 3.5 - 7.1 mg/dL​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ ​3 days
Inductively Coupled Plasma/Mass Spectrometry (ICP-MS)
Reference Lab
Medtox Laboratories
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.