Calcium Ionized

Also listed as: total calcium, serum calcium, Calcium, Ionized, ca, Calcium, Ionized, Serum
Primary unit: mg/dL
LOINC codes: 17863-2, 17864-0
Tests that measure Calcium Ionized: Labcorp 1, Quest Diagnostics 1

Ranges

Each lab publishes a reference range for the population groups it tests, usually the middle 95% of results. These intervals describe that population, not an optimal or healthy target. How ranges differ

Quest Diagnostics, Calcium, Ionized 306

Population	Interval
<8 Months	5.3-6.3 mg/dL
8-11 Months	5.2-6.1 mg/dL
1 Year	5.1-6.0 mg/dL
2 Years	4.9-5.8 mg/dL
3 Years	4.9-5.7 mg/dL
4-6 Years	4.8-5.7 mg/dL
7-12 Years	4.8-5.6 mg/dL
13-17 Years	4.8-5.5 mg/dL
18-89 Years	4.7-5.5 mg/dL
≥90 Years	4.5-5.5 mg/dL

Quest Diagnostics test catalog, 306

Tests

Check the catalog code, specimen, method and preparation for every test that measures Calcium Ionized. Select up to five tests to compare them side by side.

Labcorp 1 test

Single-analyte tests

Calcium, Ionized 004804
Serum · Fasting not stated · Turnaround 1 - 2 days
Method and collection
Method
Ion-selective electrode (ISE)
Collection
Centrifuge and send unopened gel-barrier tube with vacuum intact. It is critical that the vacuum not be disrupted. Exposure of the serum to room air causes a loss of carbon dioxide to the atmosphere. This changes the sample pH and can prevent the lab from measuring the ionized calcium. To ensure that testing can be performed, send a separate tube for ionized calcium and adhere a piece of labeling tape over the top of the tube with the following written on it “Ionized Calcium − DO NOT OPEN.”
Reference notes
4.5−5.6 mg/dL
Labcorp catalog page

Quest Diagnostics 1 test

Single-analyte tests

Calcium, Ionized 306
Serum · Fasting not stated · Turnaround Set up: Mon-Fri (Night shift); Report available: 5 days
Method and collection
Method
Ion Specific Electrode (ISE)
Collection
Let clot and spin immediately with the cap on. Do not open tube. Ship the unopened gel barrier tube at room temperature. If submitting with any other assay, please submit a separate tube for this test.
Quest Diagnostics catalog page

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Sources

Labcorp test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
LOINC 17863-2, 17864-0
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Calcium Ionized
Registered studies that measure Calcium Ionized, on the U.S. National Library of Medicine registry.

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.

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