Cleveland HeartLab S, Test

CPT Code: 84295
Order Code: C103
ABN Requirement:  No
Synonyms: Na
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): 14 days
Refrigerated (2-8°C): 14 days
Frozen (-20°C): >14 days
Deep Frozen (-70°C): >14 days

Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits; hemolyzed or grossly lipemic specimens.

Methodology: Ion Specific Electrode (ISE) test

Turn Around Time: 1 to 3 days

Reference Range:

Age mmol/L
All Ages 136-145

Critical Value:

Age Critical Low, mmol/L Critical High, mmol/L
All Ages ≤120 ≥160

Intended Use: A sodium test may be ordered to monitor electrolyte balance. A sodium test can be used to detect hyponatremia or hypernatremia associated with dehydration, edema, and a variety of diseases.

Limitations: Grossly lipemic specimens cause pseudohyponatremia as a result of fluid displacement.

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.