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Order Code LABCAI (to Mayo) Calcium, Ionized, Serum

Additional Codes

Mayo Test ID
CAI

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

Specimen Type

Serum SST
Ridgeview Laboratory Note:

NO RAPID CLOT TUBES (ORANGE CAPS)


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.

4. Test cannot be combined with other testing. Separate specimens must be submitted when multiple tests are ordered.


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 International System of Units (SI) conversion for Reference Values, see www.mayocliniclabs.com/order-tests/si-unit-conversion.html.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Day(s) Performed

Monday through Sunday

Method Name

Ion-Selective Electrode (ISE)

CPT Code Information

82330

Method Description

The pH and ionized calcium sensors in the GEM Premier 3500 Analyzer are based on the principle of ion-selective electrodes; that is, an electrical potential can be established across a membrane that is selectively permeable to a specific ion.(Instruction manual: GEM Premier 3500 Analyzer Operator's Guide. Instrumentation Laboratory; 03/2015)

Forms

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