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Test Code Billings Clinic: 7466 Mayo: CAI Calcium, Ionized, Serum

Reporting Name

Calcium, Ionized, S

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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

Method Name

Ion-Selective Electrode (ISE)


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 Type

Serum SST

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

Reject Due To

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

Reference Values

IONIZED CALCIUM

≤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

 

pH

≤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 www.mayocliniclabs.com/order-tests/si-unit-conversion.html

Interpretation

Serum ionized calcium concentrations 50% below normal will result in severely reduced cardiac stroke work. With moderate to severe hypocalcemia, left ventricular function may be profoundly depressed.

 

Ionized calcium values are higher in children and young adults.

 

Ionized calcium result has been adjusted to pH 7.40 to account for changes in specimen pH that may occur during transport. Ionized calcium concentration increases approximately 0.2 mg/dL per 0.1 pH unit decrease.

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

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

82330

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

Forms

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