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 33590-1: Neuronal nuclear IgG Qn (CSF)

Name: LOINC Code 33590-1: Neuronal nuclear IgG Qn (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.182Z

33590-1 is a LOINC code used to identify Neuronal nuclear IgG 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 Ab.IgG. 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 Ab.IgG. 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

What it does not mean

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

Key facts

Neuronal nuclear IgG Ab [Units/volume] in Cerebral spinal fluid
Neuronal nuclear Ab.IgG
ABS; Aby; ANA; ANA IgG; ANF; ANNA; Antby; Anti; Antibodies; Antibody; Antinuclear antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Hu; Immune globulin G; Immunoglobulin G; NA; Neuro; Neurology; Nuc; Point in time; QNT; Quan; Quant; Quantitative; Random; Serology; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid

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 IgG Qn (CSF)Neuronal nuclear IgG Ab [Units/volume] in Cerebral spinal fluidHu IgG CSF-aCncNeuronal nuclear Ab.IgGSERONeuronal nuclear IgG antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code33590-1

SystemLOINC

Display nameNeuronal nuclear IgG Qn (CSF)

DescriptionNeuronal nuclear Ab.IgG

Short nameHu IgG CSF-aCnc

ComponentNeuronal nuclear Ab.IgG

PropertyACnc

TimingPt

System (specimen)CSF

ScaleQn

ClassSERO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.69

Consumer names

Neuronal nuclear IgG antibody, Spinal fluid

Part names

Neuronal nuclear Ab.IgGACncPtCSFQnNeuronal Nuclear IgGArbitrary ConcentrationPoint in time (spot)Cerebral spinal fluid

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.