Calcium Ionized Serum
Ordering Info & Methodology
Test Code
Cerner Synonyms
CAI
Ionized Ca Serum, iCa Serum, Calcium, Ionized, Free Calcium, Ionized Calcium, CA Ionized, Calcium Ionized
Turn Around Time
Methodology
Analyzed within 4 hours of receipt, 24/7. Available on a STAT basis.
Ion Selective Electrode, Radiometer ABL800
Ordering Guide
Specimen Requirements
Sample Type
Collection Container
Alternate Collection Containers
Serum
Gold
Heparinized Syyringe
2.0 mL
Cannot be added on to previously collected sample.
Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.
Minimum Volume
Add On Stability
Collection and Shipping Requirements
Refrigerate. Send on ice pack.
Reference Intervals
Female Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
0 y - <1 d | Not Established | mmol/L |
1 d - <2 d | 1.13-1.39 | mmol/L |
2 d - <3 d | 1.19-1.43 | mmol/L |
3 d - <4 d | 1.22-1.50 | mmol/L |
4 d - <5 d | 1.27-1.52 | mmol/L |
5 d - <6 d | 1.26-1.56 | mmol/L |
6 d - <2 m | 1.32-1.59 | mmol/L |
2 m - <2 y | 1.20-1.40 | mmol/L |
2 y - <20 y | 1.20-1.35 | mmol/L |
≥ 20 y | 1.17-1.29 | mmol/L |
Male Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
0 y - <1 d | Not Established | mmol/L |
1 d - <2 d | 1.13-1.39 | mmol/L |
2 d - <3 d | 1.19-1.43 | mmol/L |
3 d - <4 d | 1.22-1.50 | mmol/L |
4 d - <5 d | 1.27-1.52 | mmol/L |
5 d - <6 d | 1.26-1.56 | mmol/L |
6 d - <2 m | 1.32-1.59 | mmol/L |
2 m - <2 y | 1.20-1.40 | mmol/L |
2 y - <20 y | 1.20-1.35 | mmol/L |
≥ 20 y | 1.17-1.29 | mmol/L |
Additional Notes
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Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.
Example
Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.
5%
Measurement Uncertainty
Ionized calcium is corrected to a pH of 7.4. If the patient's pH is <7.2 or >7.6, this calculation is invalid and is not performed. Ionized calcium results in patients with these extreme blood pH values may be less reliable. It is suggested to correct the underlying acidosis/alkalosis and remeasure ionized calcium prior to performing further investigations or initiating therapy.