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LOINC Code 89594-6: L. pneumophila Ag IF Ql (Lower resp)

89594-6 is a LOINC code used to identify L. pneumophila Ag IF Ql (Lower resp) 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 Legionella pneumophila Ag. It is commonly used with the system or sample type Respiratory system specimen.lower.

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 Legionella pneumophila Ag. It is commonly used with the system or sample type Respiratory system specimen.lower.

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

Legionella pneumophila Ag [Presence] in Lower respiratory specimen by Immunofluorescence
Legionella pneumophila Ag
Immunofluorescence testing of lower respiratory specimens for Legionella pneumophila antigen has over 99% specificity, but only 25-70% of patients with culture-positive disease test positive for the antigen. Therefore, IF cannot be used to rule out Legionella infection, but a positive result is nearly always diagnostic. [http//www.who.int/water_sanitation_health/emerging/legionella.pdf]
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Breathing; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; L pneumo; L pneumonphila; Legion; Legionela; Low; Lower resp; Lung; Lungs; Microbiology; Ordinal; Pneu; pneum; Pneumophilia; Point in time; PR; Pulmonary; Pulmonology; Ql; Qual; Qualitative; Random; Respiratory; RS; Screen; Spec; Time Resolved Fluorescence; 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.

Common synonyms

L. pneumophila Ag IF Ql (Lower resp)Legionella pneumophila Ag [Presence] in Lower respiratory specimen by ImmunofluorescenceL pneumo Ag Lower resp Ql IFLegionella pneumophila AgMICROLegionella pneumophila antigen, Lower respiratoryPrThr

Frequently asked questions

Code details

Code89594-6
SystemLOINC
Display nameL. pneumophila Ag IF Ql (Lower resp)
DescriptionLegionella pneumophila Ag
Short nameL pneumo Ag Lower resp Ql IF
ComponentLegionella pneumophila Ag
PropertyPrThr
TimingPt
System (specimen)Respiratory system specimen.lower
ScaleOrd
MethodIF
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.64
Last changed2.77

Consumer names

Legionella pneumophila antigen, Lower respiratory

Part names

Legionella pneumophila AgPrThrPtRespiratory system specimen.lowerOrdIFPresence or ThresholdPoint in time (spot)Lower respiratory specimenImmunofluorescence (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.

LOINC Code 89594-6 | HealthAssure