Cleveland HeartLab P, Test

CPT Code: 84132
Order Code: C104
ABN Requirement:  No
Synonyms: K+
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 3.5 – 5.1


Critical Value:

Age Critical Low, mmol/L Critical High, mmol/L
All Ages ≤2.5 ≥6.3


Intended Use: Potassium testing may be used to monitor electrolyte balance or individuals taking medications that cause the kidneys to lose potassium, including diuretics, blood pressure or heart medications. Potassium testing is also used to monitor kidney function and chronic or acute hyperkalemia.

Limitations: Hemolysis causes artificially high potassium results. Potassium concentration in erythrocytes is 25 times higher than in normal plasma.

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.