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Lab Dept:
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Chemistry
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Test Name:
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IONIZED CALCIUM
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General Information
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Lab Order Codes:
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ICA
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Synonyms:
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Calcium, Ionized, Blood, Ionized Calcium
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CPT Codes:
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82330 – Calcium, ionized
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Test Includes:
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Ionized calcium concentrations reported in mEq/L.
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Logistics
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Test Indications:
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Calcium in the fifth most common element and the most prevalent cation found in the body. Calcium exists in three physiochemical states in plasma, fee/ionized, bound and complexed with small anions. Ionized calcium is a more useful measure than total calcium and provides the best indication of calcium status because it is biologically active and is tightly regulated by hormones. Calcium is used for the assessment and treatment of parathyroid disease, a variety of bone diseases and chronic renal disease.
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Lab Testing Sections:
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Chemistry
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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30 minutes
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Special Instructions:
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See Container for special container recommendations. See Collection for special draw requirements.
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Preferred: Sims Portex® syringe (PB151) or Smooth-E syringe (956-463) Accepted: Radiometer Balanced Heparin Capillary gas tubes
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Draw Volume:
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0.4 mL (Minimum: 0.2 mL syringe, 0.1 mL capillary) blood
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Processed Volume:
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0.2 mL syringe blood, 0.1 mL capillary blood
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Collection:
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Routine venipuncture using one of the collection containers listed above. Immediately remove all air form syringe, remove needle, cap tightly, and mix. Send in original tube. Forward immediately at ambient temperature. Do not expose specimen to air.
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Special Processing:
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Lab Staff: Deliver ICA syringe/cap gas tube immediately to the lab testing station. Specimen should be analyzed within 30 minutes of collection.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabelled specimens; samples containing air; samples collected in containers other than balanced heparin; specimens older than 30 minutes; clotted samples
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Interpretive
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Reference Range:
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Age:
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Range:
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0 - 7 days:
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2.10 - 2.96 mEq/L
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8 days - 17 years:
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2.40 - 2.76 mEq/L
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>18 years:
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2.32 - 2.64 mEq/L
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Critical Values:
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<1.50 mEq/L
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Limitations:
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N/A
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Methodology:
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Ion-Selective Electrode (ISE)
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References:
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Reference: IRON Flex® reagent cartridge insert sheet PN 717085.001 (Issue Date 2009-05-15) Rev. C
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Clinical Significance, Dade Behring Inc., Glasgow Business Community, Mailbox 531, P.O. Box 6101, Newark, Delaware 19714
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Jacobs & DeMott Laboratory Test Handbook (2001) Lexi-Comp, Inc, Hudson, OH, 5th Edition
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Updates:
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2/17/2005: Critical Value previously listed as <2.00 mEq/L.
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