Calcium
| Abbrev Code: | CA | ||
| Order Code: | LAB53 | Order Name: | Calcium |
| Methodology: | Roche: Photometric
Woodwinds: Arsenazo III Dye |
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| CPT Codes: | 82310 x1, 82310 x1 | ||
| Turnaround Time: | Performed and reported 24 hours/day. | ||
| Associated Links: | |||
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. |
| Test Performed at or Referral Lab | Chemistry (Roche-CSC Maple Grove, Roche-CSC Mpls, Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Range, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, Roche-UMMC West, 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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