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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Calcium, Ionized, Whole Blood

Test Code(s): WBICA / HCWBICA

CPT Code(s): 82330

Methodology: Ion Selective Electrode

Request Form: UWHC DOWNTIME Laboratory Request Form (UWH IPDOWNTIME, 4004202); Write in test if not on form.

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: Up to 30 minutes. All requests processed stat.

Specimen Requirements

Specimen: Arterial, venous, or capillary

Patient Preparation: None.  For venous samples on outpatients, send patient to UWHC Outpatient Phlebotomy to be drawn.

Collection Instructions: Radiometer "PICO"® syringes must be free of bubbles and clots.  Two full Radiometer capillaries free of air bubbles and clots are needed for capillary blood.  Do not use green top (Lithium or Sodium Heparin) tubes.

Collection Container: Preferred: Radiometer PICO® syringe
Also Acceptable: 2 full Radiometer capillary tubes

Collection Volume: Preferred: 1.5 mL
Pediatrics: 0.5 mL

Sample Analyzed: Whole Blood

Volume Required: Preferred: 1.5 mL
Pediatrics: 0.5 mL

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220) immediately.  

Unacceptable Criteria: Clotted specimens, or specimens past stability time are not acceptable.

Stability: Ambient: 2 hours


Reference Interval:

0 days to 30 days:

3.90-6.00 mg/dL
31 days and up: 4.90-5.60 mg/dL



Critical Calls: View

CA, Whole Blood

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