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 44561-9: FLUAV Ag IF Ql (Trachea)

Name: LOINC Code 44561-9: FLUAV Ag IF Ql (Trachea)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

44561-9 is a LOINC code used to identify FLUAV Ag IF Ql (Trachea) 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 Influenza virus A Ag. It is commonly used with the system or sample type Trac.

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 Influenza virus A Ag. It is commonly used with the system or sample type Trac.

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: IF

What it does not mean

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

Key facts

Influenza virus A Ag [Presence] in Trachea by Immunofluorescence
Influenza virus A Ag
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Avian influenza; Bird flu; DFA; FA; FLUA; FLUAV; Fluorescent antibody; Fluoresent; FLUV; Fowl plague; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Influ; Influenza A; Influenza A virus; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Time Resolved Fluorescence; Trachea; TRF

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 FLUAV Ag IF Ql (Trachea) (44561-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

FLUAV Ag IF Ql (Trachea)Influenza virus A Ag [Presence] in Trachea by ImmunofluorescenceFLUAV Ag Trachea Ql IFInfluenza virus A AgMICROInfluenza A (Flu A) antigen, TracheaPrThr

Frequently asked questions

Code details

Code44561-9

SystemLOINC

Display nameFLUAV Ag IF Ql (Trachea)

DescriptionInfluenza virus A Ag

Short nameFLUAV Ag Trachea Ql IF

ComponentInfluenza virus A Ag

PropertyPrThr

TimingPt

System (specimen)Trac

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.56

Consumer names

Influenza A (Flu A) antigen, Trachea

Part names

Influenza virus A AgPrThrPtTracOrdIFPresence or ThresholdPoint in time (spot)TracheaImmunofluorescence (IF)

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.