KRBC – “Potassium – RBC” replaced by RBCK – “Potassium – Total, RBCs”

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Inactivated/Replace Test

Effective Date

07/28/2026

Included in Report

WML Test Directory Update | July 2026

Replacement Test

POTASSIUM – TOTAL, RBCS

Inactivated Test Details

Mnemonic

KRBC

Ordering Code

3718600

CPT-4 Codes(s)

84132

Replacement Test Details

Mnemonic

RBCK

Ordering Code

3300448

CPT-4 Codes(s)

84132

Turnaround Time
6 - 10 days
Performed
Varies
Legacy Code
RBCK
Example Report
Download

Specimen Information

Collect

Dark Green sodium heparin

Specimen Preparation

Centrifuge and separate plasma within 2 hours. Send 1.0 mL RBCs in the original container and replace stopper.

Alternate Specimen

Dark Green lithium heparin

Minimum Volume

0.3 mL

Transport Temperature

Refrigerated

Rejection Criteria

Room temperature, Frozen, ACD, sodium citrate, light green lithium heparin, EDTA, K2EDTA, sodium fluoride/potassium oxalate.

Stability

Room temperature: Unacceptable
Refrigerated: 30 days
Frozen: Unacceptable

Methodology

Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)
more

Reference Range

None Detected
more

Performing Laboratory

NMS Labs
more

New York DOH Approval Status

Yes
more

Interface Map for RBCK

Test Name Ordering Code Result Code Component Name LOINC Code AOE Prompt Units
Potassium - Total, RBCs3300448
3300448Potassium - Total, RBCs82722-0No

The CPT codes provided are for general informational purposes only and are based on an interpretation of AMA guidance. It is the sole responsibility of the billing party to determine CPT codes. Any questions regarding coding should be directed to the paying party.

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