Calcium


Abbrev Code:CA   
Order Code:LAB53Order Name:Calcium
Methodology:Roche: Photometric
Vista: Bichromatic end point
Woodwinds: Arsenazo III Dye
CPT Codes: 82310 x1, 82310 x1
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Roche Go Live Schedule



Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Collection Instructions:Chemistry Tests Containers Chart
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:Roche: 7 days at room temperature; 3 weeks refrigerated; 8 months frozen.
Vista: 7 days refrigerated; 6 months frozen
Test Performed at or Referral Lab Chemistry  (CSC Maple Grove, Grand Itasca, Northland, Oxboro Clinic, Range, Roche-CSC Mpls, Roche-Lakes, Roche-Ridges, Roche-St. John's, Roche-UMMC East, Southdale, UMMC/UMMCH-West Bank, Woodwinds)


Interpretive

Critical Range:Basic, Electrolyte and Renal Panels Critical Values and Reference Ranges
Reference Range:Basic, Electrolyte and Renal Panels Critical Values and Reference 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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