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25102 Magnesium, RBC (64612)

Magnesium, RBC (64612)
Test Code: MGRBCSO
Synonyms/Keywords
​​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.

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​ ​7-9  days
Inductively Coupled Plasma/Mass Spectrometry (ICP-MS)
Reference Lab
Medtox Laboratories
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
​​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.

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​ ​7-9  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.