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HelpTest Code IC Calcium, Ionized, Blood
Useful For
It is useful in evaluation of renal function and endocrine disorders, during cardiac surgery, and in neonatology.
Synonyms/Keywords
IC, Ionized Calcium, Free Calcium, i-Stat Ionized Calcium
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume |
|---|---|---|---|---|
| No | Whole Blood | Balanced/Low Heparin Blood Gas syringe |
Lithium Heparin non gel tube |
Full syringe or tube For Newborns: full balanced heparin capillary tube acceptable |
|
*Serum (MMC- Marshfield performed only) |
Serum Separator Tube (SST) |
|
5 to 10 mL tube filled completely. **Unopened Primary Tube DO NOT REMOVE CAP FROM THE TUBE, DO NOT ALIQUOT |
*See further collection instructions below
Collection/Processing Instructions
Collection/Processing Instructions
| Collection Site | Container | Collection Instructions |
| MMC- Marshfield | Whole Blood syringe/capillary tube | Collect anaerobically in a syringe or capillary tube. Upon receipt in the lab, do not centrifuge. Deliver to blood gas testing section. |
| SST | Collect anaerobically 5-10 mL SST tube completely. Upon receipt in the lab, centrifuge, but DO NOT REMOVE CAP from tube. Deliver to blood gas testing section | |
|
MMC (hospital) lab sites |
Whole Blood syringe | Collect anaerobically in a syringe or capillary tube. Upon receipt in the lab, do not centrifuge. Deliver to blood gas testing section |
|
Freestanding Marshfield Clinics and non-Marshfield Clinic locations |
SST | Collect anaerobically 5-10 mL SST tube completely. Centrifuged within 4 hours of collection and DO NOT REMOVE CAP from tube. DO NOT ALIQUOT. Send entire tube to Hub/MMC-Marshfield Lab refrigerated. |
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole Capillary Tube | Ambient or Ice Pack | 30 minutes |
| Ambient | ||
|
Whole Blood Syringe/ non-gel heparin tube |
30 minuutes | |
| Refrigerated | 4 hours | |
| SST spun | Ambient | 6 hours |
| Refrigerated | 70 hours |
Rejection Criteria
| Specimens exposed to air |
|---|
| Plasma separator tubes |
| Capillary tubes other than balanced-heparin |
| Gross hemolysis |
| SST not spun |
Test Information
Analysis does not include a total calcium. The total calcium must be ordered as a separate test if needed.
When determining ionized calcium for diagnosis of a disorder in Ca metabolism, a four hour fasting sample is recommended.
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| All Performing Sites | 0-4 days: 4.3-5.5 mg/dL 5-29 days: 4.8-6.0 mg/dL 1 mo.-19 yrs.: 4.9-5.5 mg/dL ≥20 yrs.: 4.5-5.3 mg/dL |
|
See Critical Value List for list of current critical values |
|
Marshfield Labs Performing Department
Marshfield Labs Urinalysis
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Weston | Monday through Sunday | Less than 2 hours | Radiometer |
| Eau Claire | Monday through Sunday | Less than 2 hours | Gem 4000 |
| Ladysmith | Monday through Sunday | Less than 2 hours | Gem 4000 |
| Park Falls | Monday through Sunday | Less than 2 hours | Gem 4000 |
| Rice Lake | Monday through Sunday | Less than 2 hours | Gem 4000 |
| Marshfield | Monday through Sunday | Less than 2 hours | Gem 4000 |
| Minocqua | Monday through Sunday | Less than 2 hours | Reference Electrode/Gem 4000 |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82330 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 82330 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Calcium, Ionized, Blood |