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HelpTest Code LAB0232140 Calcium, Ionized, Serum
Additional Codes
| Mayo Test ID |
|---|
| CAI |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Assessing calcium states during liver transplantation surgery, cardiopulmonary bypass, or any procedure requiring rapid transfusion of whole blood in neonates and critically ill patients
Second-order test in the evaluation of patients with abnormal calcium values
Method Name
Ion-Selective Electrode (ISE)
Reporting Name
Calcium, Ionized, SSpecimen Type
Serum SSTSpecimen Required
Container/Tube: Serum gel or serum gel microtainer
Specimen Volume: Full tube
Collection Instructions:
1. Allow blood to clot for 30 minutes.
2. Serum gel tube/microtainer must be centrifuged within 1 hour of collection. Centrifuge with stopper in place for 7 minutes at 3000 rpm to ensure that the gel barrier separates the serum and cells.
3. Keep specimen anaerobic; do not aliquot.
Specimen Minimum Volume
1.75 mL in a 3.5 mL (50% full) in serum gel tube or 1 full serum gel microtainer
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum SST | Refrigerated | 7 days | SERUM GEL TUBE |
Reject Due To
| Gross hemolysis | Reject |
| Tubes less than 50% full Specimens that have been aliquoted, opened, or poorly centrifuged |
Reject |
Reference Values
IONIZED CALCIUM
≤13 days old: Not established
14 days-<1 year: 5.21-5.99 mg/dL
1-<2 years: 5.04-5.84 mg/dL
2-<3 years: 4.87-5.67 mg/dL
3-23 years: 4.83-5.52 mg/dL
24-97 years: 4.57-5.43 mg/dL
≥98 years: Not established
pH
≤13 days old: Not established
14 days-97 years old: 7.35-7.48
≥98 years old: Not established
For SI unit Reference Values, see www.mayocliniclabs.com/order-tests/si-unit-conversion.html
Interpretation
Serum ionized calcium concentrations 50% below normal will result in severely reduced cardiac stroke work. With moderate to severe hypocalcemia, left ventricular function may be profoundly depressed.
Ionized calcium values are higher in children and young adults.
Ionized calcium result has been adjusted to pH 7.40 to account for changes in specimen pH that may occur during transport. Ionized calcium concentration increases approximately 0.2 mg/dL per 0.1 pH unit decrease.
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 daySpecimen Retention Time
7 daysTest Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82330
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CAI | Calcium, Ionized, S | 57333-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CAIS | Calcium, Ionized, S | 57333-7 |
| PHCC | pH | 2753-2 |
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.