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 37991-7: Neutrophil cytoplasmic Ab.perinuclear IA Qn (S)

Name: LOINC Code 37991-7: Neutrophil cytoplasmic Ab.perinuclear IA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:25.627Z

37991-7 is a LOINC code used to identify Neutrophil cytoplasmic Ab.perinuclear IA 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.perinuclear. It is commonly used with the system or sample type Ser.

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 Neutrophil cytoplasmic Ab.perinuclear. 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
Method: IA

What it does not mean

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

Key facts

Neutrophil cytoplasmic Ab.perinuclear [Units/volume] in Serum by Immunoassay
Neutrophil cytoplasmic Ab.perinuclear
ACNA; ACPA; ANCA; Arbitrary Concentration; Cytopl; Cytoplas; EIA; ELFA; ELISA; Enzyme immunoassay; Granulocyte ab; Granulocyte nucleus ab; IAA; MEIA; Neut; Neutr; Neutrophils; NSNA; pANCA; p-ANCA; Perinuclear ANCA; PMN; PNM; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Serum; SR; SUDS; 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.

Common synonyms

Neutrophil cytoplasmic Ab.perinuclear IA Qn (S)Neutrophil cytoplasmic Ab.perinuclear [Units/volume] in Serum by Immunoassayp-ANCA Ser IA-aCncNeutrophil cytoplasmic Ab.perinuclearSERONeutrophil Cytoplasmic Ab.perinuclear, BloodACnc

Frequently asked questions

Code details

Code37991-7

SystemLOINC

Display nameNeutrophil cytoplasmic Ab.perinuclear IA Qn (S)

DescriptionNeutrophil cytoplasmic Ab.perinuclear

Short namep-ANCA Ser IA-aCnc

ComponentNeutrophil cytoplasmic Ab.perinuclear

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIA

ClassSERO

Example unitsElisa units

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.13

Last changed2.73

Consumer names

Neutrophil Cytoplasmic Ab.perinuclear, Blood

Part names

Neutrophil cytoplasmic Ab.perinuclearACncPtSerQnIAArbitrary ConcentrationPoint in time (spot)SerumImmunoassay

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.