What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCBoth

LOINC Code 23839-4: Cholinesterase Calc Qn (RBC)

Name: LOINC Code 23839-4: Cholinesterase Calc Qn (RBC)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:12.417Z

23839-4 is a LOINC code used to identify Cholinesterase Calc Qn (RBC) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cholinesterase. It is commonly used with the system or sample type RBC.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Cholinesterase. It is commonly used with the system or sample type RBC.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: DEPRECATED
Order vs observation: Both
Method: Calculated

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Deprecated Cholinesterase [Enzymatic activity/volume] in Red Blood Cells
Cholinesterase
RBC CHOLIN. ACTIVITY=RBC CHOLINEST-(SERUM CHOLINEST X (1-HCT/100))/HCT/100
Acylcholine acylhydrolase; Arbitrary concentration; BChE; Benzoyl cholinesterase; Benzoylcholinesterase; Butyrylcholine esterase; Calc; Calculation; Che; Chemistry; Choline esterase II; CHS; Erythrocytes; Point in time; Pseudocho; Pseudocholinesterase; QNT; Quan; Quant; Quantitative; Random; Red blood cells; Red blood corpusles

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Cholinesterase Calc Qn (RBC)Deprecated Cholinesterase [Enzymatic activity/volume] in Red Blood CellsDeprecated Cholinesterase RBC Calc-aCncCholinesteraseCHEMCholinesterase, Red blood cellsACnc

Frequently asked questions

Code details

Code23839-4

SystemLOINC

Display nameCholinesterase Calc Qn (RBC)

DescriptionCholinesterase

Short nameDeprecated Cholinesterase RBC Calc-aCnc

ComponentCholinesterase

PropertyACnc

TimingPt

System (specimen)RBC

ScaleQn

MethodCalculated

ClassCHEM

StatusDEPRECATED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0n

Last changed2.69

Consumer names

Cholinesterase, Red blood cells

Part names

CholinesteraseACncPtRBCQnCalculatedArbitrary ConcentrationPoint in time (spot)Red Blood Cells

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.