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.

LOINCActiveObservation

LOINC Code 31398-1: Ganglioside GD1a IgM Qn (CSF)

Name: LOINC Code 31398-1: Ganglioside GD1a IgM Qn (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

31398-1 is a LOINC code used to identify Ganglioside GD1a IgM 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 Ganglioside GD1a Ab.IgM. It is commonly used with the system or sample type CSF.

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 Ganglioside GD1a Ab.IgM. 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: Observation

What it does not mean

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

Key facts

Ganglioside GD1a IgM Ab [Units/volume] in Cerebral spinal fluid
Ganglioside GD1a Ab.IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Disialolganglioside; GD1a; GD1a Gangl; Immune globulin M; Immunoglobulin M; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Ganglioside GD1a IgM Qn (CSF) (31398-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Ganglioside GD1a IgM Qn (CSF)Ganglioside GD1a IgM Ab [Units/volume] in Cerebral spinal fluidGD1a Gangl IgM CSF-aCncGanglioside GD1a Ab.IgMSEROGanglioside GD1a IgM antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code31398-1

SystemLOINC

Display nameGanglioside GD1a IgM Qn (CSF)

DescriptionGanglioside GD1a Ab.IgM

Short nameGD1a Gangl IgM CSF-aCnc

ComponentGanglioside GD1a Ab.IgM

PropertyACnc

TimingPt

System (specimen)CSF

ScaleQn

ClassSERO

Example unitsarb U/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.07

Last changed2.68

Consumer names

Ganglioside GD1a IgM antibody, Spinal fluid

Part names

Ganglioside GD1a Ab.IgMACncPtCSFQnGanglioside GD1a IgMArbitrary 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.