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 6591-2: Yellow fever virus neut ab Neut test Qn (S)

Name: LOINC Code 6591-2: Yellow fever virus neut ab Neut test Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

6591-2 is a LOINC code used to identify Yellow fever virus neut ab Neut test 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 Yellow fever virus Ab.Neut. It is commonly used with the system or sample type Ser.

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 Yellow fever virus Ab.Neut. 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: Neut

What it does not mean

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

Key facts

Yellow fever virus neutralizing antibody [Units/volume] in Serum by Neutralization test
Yellow fever virus Ab.Neut
ABS; Aby; American plague; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Conventional virus neutralization test; cVNT; ID; Infectious Disease; InfectiousDisease; Microbiology; NAb; NEUTRALIZATION; Neutralization test; NT; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; Serum virus neutralization; SR; SVN; Virus neutralization test; VNT; yellow jack; YFV

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 Yellow fever virus neut ab Neut test Qn (S) (6591-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Yellow fever virus neut ab Neut test Qn (S)Yellow fever virus neutralizing antibody [Units/volume] in Serum by Neutralization testYFV NAb Ser Nt-aCncYellow fever virus Ab.NeutMICROYellow Fever virus neutralizing antibody, BloodACnc

Frequently asked questions

Code details

Code6591-2

SystemLOINC

Display nameYellow fever virus neut ab Neut test Qn (S)

DescriptionYellow fever virus Ab.Neut

Short nameYFV NAb Ser Nt-aCnc

ComponentYellow fever virus Ab.Neut

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodNeut

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0g

Last changed2.72

Consumer names

Yellow Fever virus neutralizing antibody, Blood

Part names

Yellow fever virus Ab.NeutACncPtSerQnNeutArbitrary ConcentrationPoint in time (spot)SerumNeutralization test

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.