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.

LOINCActiveBoth

LOINC Code 5128-4: Neutrophil cytoplasmic Ab Qn (S)

Name: LOINC Code 5128-4: Neutrophil cytoplasmic Ab Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

5128-4 is a LOINC code used to identify Neutrophil cytoplasmic Ab Qn (S) 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 Neutrophil cytoplasmic Ab. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Neutrophil cytoplasmic Ab. It is commonly used with the system or sample type Ser.

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: ACTIVE
Order vs observation: Both

What it does not mean

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

Key facts

Neutrophil cytoplasmic Ab [Units/volume] in Serum
Neutrophil cytoplasmic Ab
ABS; Aby; ACNA; ACPA; ANCA; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Cytopl; Cytoplas; Granulocyte ab; Granulocyte nucleus ab; Neut; Neutr; Neutrophils; PMN; PNM; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Serum; SR; Vasculitis

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Neutrophil cytoplasmic Ab Qn (S) (5128-4)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Neutrophil cytoplasmic Ab Qn (S)Neutrophil cytoplasmic Ab [Units/volume] in SerumANCA Ab Ser-aCncNeutrophil cytoplasmic AbSERONeutrophil cytoplasmic antibody, BloodACnc

Frequently asked questions

Code details

Code5128-4

SystemLOINC

Display nameNeutrophil cytoplasmic Ab Qn (S)

DescriptionNeutrophil cytoplasmic Ab

Short nameANCA Ab Ser-aCnc

ComponentNeutrophil cytoplasmic Ab

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassSERO

Example unitsarb U/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.73

Consumer names

Neutrophil cytoplasmic antibody, Blood

Part names

Neutrophil cytoplasmic AbACncPtSerQnArbitrary ConcentrationPoint in time (spot)Serum

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.