Sign in →

Test Code MG/LAB103 Magnesium, Serum or Plasma

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center / Ashland Community Hospital

Specimen Requirements

Yellow (Gold) top tube (SST)  

Lithium Heparin Green top tube

Plain Red top tube  


Outpatient clients MUST draw SST

Specimen Transport Temperature and Stability

Centrifuge and refrigerate within 2 hours of collection. 
Spun SST is stable for 48 hours at 2° to 8° C.

Specimen Minimum Volume

0.5 mL

Reasons for Rejection


Quantity not sufficient (QNS)

Lack of Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth 

Day(s) Test Set Up

Routine – same day

ASAP – 2 hours after receipt of specimen in lab

STAT – 1 hour after receipt of specimen in lab

Additional Information

Magnesium deficiency produces neuromuscular disorders.  It may cause weakness, tremors and convulsions.  Decreases may be seen in malnutrition, alcoholism, acute pancreatitis, severe diarrhea and following GI
surgery.  Elevated levels are observed in uremia, growth hormone therapy, Vitamin D intoxication, Addison’s disease and the treatment of preeclampsia.


Timed Endpoint

Performing Department


Test Classification and CPT Coding

83735  Magnesium

Billing Code