Sign in →

Test Code CAI Calcium, Ionized, Serum

Important Note

For Medical Associates Clinic Dubuque use only.

Additional Codes


MA Cerner: Calcium Ionized

Reporting Name

Calcium, Ionized, S

Useful For

Assessing calcium states during liver transplantation surgery, cardiopulmonary bypass, or any procedure requiring rapid transfusion of whole blood in neonates and critically ill patients


Second-order test in the evaluation of patients with abnormal calcium values

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum SST

Specimen Required

Container/Tube: Serum gel or serum gel microtainer

Specimen Volume: Full tube

Collection Instructions:

1. Allow blood to clot for 30 minutes.

2. Serum gel tube/microtainer must be centrifuged within 1 hour of collection. Centrifuge with stopper in place for 7 minutes at 3000 rpm to ensure that the gel barrier separates the serum and cells.

3. Keep specimen anaerobic; do not aliquot.

Specimen Minimum Volume

1.75 mL in a 3.5 mL (50% full) in serum gel tube or 1 full serum gel microtainer

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum SST Refrigerated 7 days SERUM GEL TUBE

Reference Values


≤13 days old: Not established

14 days-<1 year: 5.21-5.99 mg/dL

1-<2 years: 5.04-5.84 mg/dL

2-<3 years: 4.87-5.67 mg/dL

3-23 years: 4.83-5.52 mg/dL

24-97 years: 4.57-5.43 mg/dL

≥98 years: Not established



≤13 days old: Not established

14 days-97 years old: 7.35-7.48

≥98 years old: Not established


For SI unit Reference Values, see

Day(s) Performed

Monday through Sunday

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
CAI Calcium, Ionized, S 57333-7


Result ID Test Result Name Result LOINC Value
CAIS Calcium, Ionized, S 57333-7
PHCC pH 2753-2

Report Available

Same day/1 day

Reject Due To

Gross hemolysis Reject
Tubes less than 50% full
Specimens that have been aliquoted, opened, or poorly centrifuged

Method Name

Ion-Selective Electrode (ISE)

Secondary ID



If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.