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 49066-4: WEEV IgG and IgM (CSF) [Interp]

Name: LOINC Code 49066-4: WEEV IgG and IgM (CSF) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.170Z

49066-4 is a LOINC code used to identify WEEV IgG and IgM (CSF) [Interp] 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 Western equine encephalitis virus Ab.IgG & IgM. 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 Western equine encephalitis virus Ab.IgG & 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

Western equine encephalitis virus IgG and IgM [Interpretation] in Cerebral spinal fluid
Western equine encephalitis virus Ab.IgG & IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Enc; Enceph; Encephalomyelitis; Equin; ID; IgG+IgM; Immune globulin G; Immune globulin M; Immunoglobulin G; Immunoglobulin M; Impression; Impression/interpretation of study; Impressions; Infectious Disease; InfectiousDisease; Interp; Interpretation; Microbiology; Neuro; Neurology; Nominal; Point in time; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Togavirus; WEE virus; WEEV; West

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

WEEV IgG and IgM (CSF) [Interp]Western equine encephalitis virus IgG and IgM [Interpretation] in Cerebral spinal fluidWEEV IgG+IgM CSF-ImpWestern equine encephalitis virus Ab.IgG & IgMMICROWEEV IgG and IgM antibodies, Spinal fluidImp

Frequently asked questions

Code details

Code49066-4

SystemLOINC

Display nameWEEV IgG and IgM (CSF) [Interp]

DescriptionWestern equine encephalitis virus Ab.IgG & IgM

Short nameWEEV IgG+IgM CSF-Imp

ComponentWestern equine encephalitis virus Ab.IgG & IgM

PropertyImp

TimingPt

System (specimen)CSF

ScaleNom

ClassMICRO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.73

Consumer names

WEEV IgG and IgM antibodies, Spinal fluid

Part names

Western equine encephalitis virus Ab.IgG & IgMImpPtCSFNomWestern equine encephalitis virus IgG and IgMImpression/interpretation of studyPoint 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.