Test Code LAB7856 Calcium, Ionized, Blood

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Direct Ion-Selective Electrode (ISE)

Literature Reference:

Reference manual: ABL 800 FLEX Series. Radiometer America, Bronshoj Denmark, 2009.

Specimen Requirements

Patient Preparation:Fasting specimen is preferred but not required.

Specimen must be received in the laboratory within 2 hours of draw.

Hospital Patient:

Specimen Type: Whole blood, heparinized

Container/Tube: Sims-Portex blood gas syringe

Specimen Volume: Full syringe

Collection Instructions: Avoid prolonged venous stasis when drawing blood.

Additional Information: Send capped syringe (no needle attached) to the laboratory.

Non Hospital Patient:

Call Barnes-Jewish Hospital Laboratory Customer Service at 314-362-1470 prior to collection to schedule a STAT pick-up.

Specimen Type: Whole blood, heparinized

Container/Tube: Sims-Portex blood gas syringe

Specimen Volume: Full syringe

Collection Instructions: Avoid prolonged venous stasis when drawing blood.

Additional Information: Send capped syringe (no needle attached) to the laboratory.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 15 minutes after receipt in laboratory
Routine: not available

Test Classification and CPT Coding

82330

Reference Values

0 minutes - 1 day: 4.50-5.75 mg/dL

> 1 day - 4 days: 4.15-5.40 mg/dL

> 4 days - 180 days: 4.85-5.80 mg/dL

> 180 days - 30 months: 4.60-5.50 mg/dL

> 30 months - 18 years: 4.45-5.25 mg/dL

> 18 years: 4.5-5.1 mg/dL

Critical result (automatic call-back): ≤3.2 mg/dL or ≥7.0 mg/dL

Literature References:

Ladenson JH, et al. Relationship of free and total calcium in hypercalcemic conditions. J Clin Endocrinol Metab 1979;48:393-7.

Specimen Transport Temperature

Ambient < 2hrs /Refrigerate NO/Frozen NO

Additional Information

For BJH Laboratory Use Only
Analyte Stability:

See Analyte Stability Chart under General Information for a complete list.

Once opened the specimen is no longer suitable for add on.

Laboratory Processing Instructions:

Test performed in BJH Core Lab. Deliver to the blood gas workstation immediately.

Special Instructions