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 54921-2: Neuronal nuclear type 2 Ab IA Qn (CSF)

Name: LOINC Code 54921-2: Neuronal nuclear type 2 Ab IA Qn (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:37.142Z

54921-2 is a LOINC code used to identify Neuronal nuclear type 2 Ab IA Qn (CSF) 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 Neuronal nuclear type 2 Ab. It is commonly used with the system or sample type CSF.

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 Neuronal nuclear type 2 Ab. It is commonly used with the system or sample type CSF.

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

Neuronal nuclear type 2 Ab [Units/volume] in Cerebral spinal fluid by Immunoassay
Neuronal nuclear type 2 Ab
ABS; Aby; ANNA 2; ANNA-2; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; EIA; ELFA; ELISA; Enzyme immunoassay; Hu; Hu2; IAA; II; MEIA; Neuro; Neurology; Neuronal nuclear type II; Nuc; Paraneoplastic syndrome; Point in time; QNT; Quan; Quant; Quantitative; Random; RI; Serology; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; SUDS

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

Neuronal nuclear type 2 Ab IA Qn (CSF)Neuronal nuclear type 2 Ab [Units/volume] in Cerebral spinal fluid by ImmunoassayHu2 Ab CSF IA-aCncNeuronal nuclear type 2 AbSERONeuronal nuclear type 2 antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code54921-2

SystemLOINC

Display nameNeuronal nuclear type 2 Ab IA Qn (CSF)

DescriptionNeuronal nuclear type 2 Ab

Short nameHu2 Ab CSF IA-aCnc

ComponentNeuronal nuclear type 2 Ab

PropertyACnc

TimingPt

System (specimen)CSF

ScaleQn

MethodIA

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.27

Last changed2.69

Consumer names

Neuronal nuclear type 2 antibody, Spinal fluid

Part names

Neuronal nuclear type 2 AbACncPtCSFQnIAArbitrary ConcentrationPoint in time (spot)Cerebral spinal fluidImmunoassay

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.