Calcium, Total

Cleveland HeartLab C, Test

CPT Code: 82310
Order Code: C102
ABN Requirement:  No
Synonyms: Ca; Calcium, Total; Total Calcium
Specimen: Serum
Volume: 0.5 mL
Minimum Volume: 0.2 mL
Container: Gel-barrier tube (SST, Tiger Top)


  1. Collect and label sample according to standard protocols.
  2. Gently invert tube 5 times immediately after draw. DO NOT SHAKE.
  3. Allow blood to clot 30 minutes.
  4. Centrifuge for 10 minutes.

Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions provided with the Cleveland HeartLab shipping box.


Ambient (15-25°C): 7 days
Refrigerated (2-8°C): 3 weeks
Frozen (-20°C): 8 months
Deep Frozen (-70°C): 8 months

Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits

Methodology: Photometric

Turn Around Time: 1 to 3 days

Reference Range:

Age mg/dL
All Ages 8.5-10.5


Critical Value:

Age Critical Low, mg/dL Critical High, mg/dL
All Ages ≤6.0 ≥13.0


Intended Use: A calcium test may be ordered for the evaluation of bone, endocrine and metabolic disorders. In addition, calcium test may be used to monitor calcium levels in individuals with cancer or kidney disease.

Limitations: Intravenously administered contrast media for MRI (magnetic resonance imaging) contain chelating complexes which may interfere with the determination of calcium. A sharp decrease in calcium values was observed when gadodiamide (GdDTPA-BMA) was administered. Follow the instructions of the manufacturer with regard to the retention time of the contrast medium. Drugs containing strontium salts may lead to significantly increased calcium results. In very rare cases gammopathy may cause unreliable results.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.