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Calcium, Ionized

Tube Type


Test ID   LAB54
EPIC Order
CPT Code(s)   82330
Group/Individual Test   Individual
Laboratory   Core Laboratory-Blood Gas
Tube Station   31
Specimen Routine: 1.0 mL blood in 3cc syringe w/lyophylized heparin (BG Kit) or minimum volume 1 ml if collected in 7 mL green top (heparin) blood collection tube; see Comments.  Deliver immediately to the lab.
  micro: 0.5 mL blood in 1cc syringe w/lyophylized heparin (BG Kit) or Green top (Heparin) tube
Availability Routine: 24 Hours/Day
  STAT: Yes
Reference Range Normal: See Table Below

If transport is delayed > 10 minutes, place specimen on ice and deliver or "tube" immediately.
Specimens with Needles attached will NOT be accepted.

Samples >30 minutes old may have unreliable results.

Reference Ranges - Ionized Calcium

  mg/dL SI Units (mmol/L)
Reference Range: 4.4-5.4 1.10-1.35
Critical Value: <3.2 or >6.5 <0.8 or >1.625

Reviewed by jcayless on December 11, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514