ARUP's Laboratory Test Directory
| 0020135: Calcium, Ionized, Serum |
| Test Mnemonic: IONCA-S | |
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Methodology: Ion-Selective Electrode/pH-Electrode
Performed: Sun-Sat Reported: Within 24 hours |
| Specimen Required: | |
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Collect: One 5 mL SST. Centrifuge with stopper in place within one hour of collection. Do not open the tube or split the sample.
Transport: 5 mL serum in original SST at 2-8°C. Ship upright in original collection tube. (Min: 0.5 mL) Do not ship on dry ice. Pediatric Collection/Transport: 0.5 mL serum in original SST at 2-8°C. Ship upright in original collection tube. Remarks: Do not ship on dry ice. Place the original SST into a pressure container for shipping: ARUP Supply #19815 (Container, Infectious Shipping, Small, w/ absorbent material). Instruction for use: Wrap the primary container that holds the specimen in the absorbent material. Place the primary container and absorbent material in the pressure container. Tighten the screw-cap lid until it engages the tamper seal. Mark the shipping temperature, located on the outside of the pressure container. Place the secondary container in the outer packaging. Further information can be found in the front section of the User's Guide. Do not freeze separator tube. Do not expose specimen to air at any time during collection or transport process. Stability: Ambient: 24 hours; Refrigerated: 1 week; Frozen: Unacceptable |
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| Reference Interval: |
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Ionized calcium (ISE): Birth up to 1 month: 1.10-1.35 mmol/L 1 month-adult: 1.11-1.30 mmol/L Ionized calcium (calculation at pH 7.4): Birth up to 1 month: 1.10-1.35 mmol/L 1 month-adult: 1.11-1.30 mmol/L |
| Note: | |
| Differences between the ionized calcium result and the ionized calcium normalized to pH 7.4 are due to the sample having a pH significantly different from pH 7.4. Sample pH may be artificially decreased due to delayed processing and may be increased when the sample is exposed to air. Due to these factors, it is recommended that the ionized calcium normalized to pH 7.4 be interpreted with caution and only used when the clinician has knowledge of the patient's acid/base status. Accurate determination of in vivo pH is best determined by arterial blood gas testing. |
| CPT Code(s): | |
| 82330 |