CALCIUM, IONIZED

Specimen Required
Draw blood in a SST. Allow blood to clot 30-60 minutes and centrifuge with stopper in place 10 minutes. Send unopened tube refrigerated. Minimum volume 1.0 mL

Alternate Specimen
Sodium or Lithium heparin separator tubes only

Rejection Criteria
Samples not drawn in separator tubes or opened samples. Frozen or aliquoted samples are not acceptable for ionized calcium. Hemolyzed samples.

Methodology
Ion Selective Electrode

Stability
Room Temperature: Unacceptable; Refrigerated: 48 hours unopened; Frozen: Unacceptable

Reference Range
4.6–5.4 mg/dL
Critical values: <=3.5 mg/dL and >= 6.5 mg/dL

Performed
Monday-Friday

Turnaround Time1-3 days
Test CodeICA
CPT-4 Code (s)
82330
LOINC Codes
17863-2

Warde
Medical
Laboratory