Calcium, Ionized CAIO

Synonyms

Allscripts (AEHR) Order Name

Calcium, Ionized

Sunrise Clinical Manager (SCM) Order Name

Calcium, Ionized

EPIC Order Name

Ionized Calcium

Clinical Info

Evaluate nonbound calcium, calcium metabolism, physiologically active calcium fraction, hyperparathyroidism, ectopic hyperparathyroidism. Occasionally useful when hypercalcemia coexists with abnormal protein state such as myeloma. Useful in assessing active calcium fraction in hypoproteinemia and acidosis when calcium is low.

Specimen Type

Blood

Specimen Volume

Hospital Labs: 1-3 mL Lithium Heparin (Mint Green) or Heparinized Syringe


Outreach: 1 - 2 mL serum - Send a dedicated UNOPENED primary tube 
No test add on accepted, unless unopened tube is available
Samples received in aliquot tube will be rejected

Container

Hospital Labs: Lithium Heparin (Mint Green) or Heparinized Syringe
Outreach: Gold Top Tube (must be full)

Collection Instructions

Hospital Labs:
Collect blood into Heparinized Blood Gas Syringe or Lithium Heparin (Mint Green) tube.
Sample must be mixed thoroughly immediately after sample collection and analyzed within 30 minutes from collection to optimize sample quality.
For Outreach:
Draw blood into a serum gel separator tube, completely filling the tube. Allow blood to clot for 30 minutes. Centrifuge and send UNOPENED gel-barrier tube with vacuum intact. It is critical that the vacuum not be disrupted. Exposure of the serum to room air causes a loss of carbon dioxide to the atmosphere. This changes the sample pH and can prevent the lab from measuring the ionized calcium
NOTE: It is recommended to analyze samples within 30 minutes from draw to optimize sample quality
NOTE: Sample exposure to atmospheric air can affect ionized calcium and consequently the pH in the sample

Transport Instructions

Refrigerated UNOPENED tube

Specimen Stability

Outreach:14 Days Refrigerated (UNOPENED tube only)

Methodology

Ion-Selective Electrode (ISE)

Days Performed

Monday through Sunday

Performing Laboratories

Northwell Health Hospital Laboratories (RRL) for Hospital Patients
Northwell Core Lab (CFAM) for Outreach

CPT

82330
LOINC Code: 41645-3

PDM

5300400

Result Interpretation

Reference Range:

Hospital patients 1.15 – 1.33 mmol/L

Outreach (venous) 1.16 to 1.32 mmol/L

Forms

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