Magnesium


Sunquest Code:MG  
Epic Code:LAB103Epic Name:Magnesium
Synonyms:MG
Methodology:Bichromatic endpoint
St. Johns/St Joseph/Woodwinds: Enzymatic
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), St Johns/St Joseph/Woodwinds-Green (lithium heparin, no gel) (Green (sodium heparin, no gel), Red (no gel), Red or gold (gel), St Johns/St Joseph/Woodwinds - Red (no 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.
Stability:Stability: Room or refrigerated temperature - 7 days; frozen - 1 year.
Test Performed at or Referral Lab Chemistry  (University of Minnesota Health Maple Grove Clinics, Range, UMMC-East Bank, Oxboro Bloom, Lakes, Ridges, Northland, Southdale, UMMC/UMMCH-West Bank, M Health Clinic and Surgery Center, Grand Itasca, St. Joseph's, St. John's, Woodwinds)


Interpretive

Critical Range:
Site mg/dL
St Johns/St Joseph/ Woodwinds <1.1 and >4.0
Grand Itasca <1.2 and >5.9
All other sites <1.0 and >7.0
 
Reference Range:
Site Age mg/dL
Grand Itasca All 1.9-2.7
St Johns/St Joseph/Woodwinds All 1.8-2.6
All other sites 0-6 d 1.2-2.6
All other sites 7d - 5y 1.6-2.4
All other sites 6 y & older 1.6-2.3
 
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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