Magnesium


Sunquest Code:MG  
Epic Code:LAB103Epic Name:Magnesium
Synonyms:MG
Methodology:Bichromatic end point
CPT Code:83735
Turnaround Time:Performed and reported 24 hours/day.


Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel) (Green (lithium heparin) on ICE, Green (sodium heparin, no gel), Green (sodium heparin, no gel) on ICE, Red (no gel), Red or gold (gel))


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (University of Minnesota Health Maple Grove Clinics, Fairview Range - FRMC, UMMC-East Bank, Oxboro Bloom, Fairview Lakes - FLMC, Fairview Ridges - FRH, Fairview Northland - FNMC, Fairview Southdale - FSH, UMMC/UMMCH-West Bank, M Health Clinic and Surgery Center, Grand Itasca GICH)


Interpretive

Critical Range:Greater than 7.0 mg/dL
GICH: Less than 1.2 or greater than 5.9 mg/dL
Reference Range:
Age mg/dL
0-6 days 1.2-2.6
7 d - 5 y 1.6-2.4
6 y and older 1.6-2.3
 GICH: All ages 1.9-2.7 mg/dL  
Use:Hypomagnesemia, seen in malabsorption, pancreatitis, hypoparathyroidism, chronic alcoholism and DT's, chronic glomerulonephritis, aldosteronism, digoxin toxicity, protracted IV feedings and chlorothiazide therapy. Hypocalcemia refractory to treatment may occur if there is underlying hypomagnesemia. Hypermagnesemia is seen in dehydration, severe diabetic acidosis, Addison's disease, uremia, and iatrogenic MgSO4 therapy in obstetric patients with preeclampsia.


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