Calcium


Sunquest Code:CA  
Epic Code:LAB53Epic Name:Calcium
Methodology:Bichromatic end point
St. Johns/St Joseph/Woodwinds: Arsenazo III Dye
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 (lithium heparin, no gel), Red (no gel), Red or gold (gel), St Johns/St Joseph/Woodwinds - Red (no gel))
Collection Instructions:Some diurnal variation is observed, so a morning, fasting sample is preferred. Approximately half of serum calcium is bound to proteins; therefore, posture will produce variation in results.


Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Refrigerate immediately and maintain anaerobically if sample will not be tested within 4 hours.
Shipping Instructions:Ship at refrigerated temperature.
Stability:Stability: Refrigerated - 7 days; frozen - 6 months.
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:Chemistry Reference Ranges and Critical Ranges  
Reference Range:Chemistry Reference Ranges and Critical Ranges  
Limitations:Calcium added after 4 hours may be elevated by up to 0.4 mg/dL if the container is not refrigerated and maintained anaerobically.
Use:

When hypocalcemia or hypercalcemia is suspected, or to monitor treatment for calcemic disorder.    



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