Test Overview
Test Methodology

ISE

Test Usage

Ionized calcium is the physiologically active form of calcium and a better indicator than total calcium of the functional status of calcium metabolism.

Reference Range *

1.12 - 1.30 mmol/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

2 hours

Soft Order Code
ICAL
MiChart Code
Calcium, Ionized
Synonyms
  • Free Calcium
  • Ionized Calcium
  • CALCIUM, IONIZED
  • ICAL
Laboratory
Chemical Pathology
Section
Automation
STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

Specimen Requirements
Collection Instructions

Collect specimen in SST (preferred) or green top tube. Do not aliquot serum or remove stopper for any reason. Centrifuge and refrigerate intact specimen.

Alternate Specimen
SST tube preferred; Green top (sodium or lithium heparin) acceptable. (8/03)
Rejection Criteria
Other Rejected Containers: Open Containers, EDTA plasma (lavender)
Yellow Top Tube
Normal Volume
2 mL serum
Minimum Volume
0.3 mL serum
Billing
CPT Code
82330
Fee Code
22194
LOINC
1994-3
Resources