LOINCActiveBoth

LOINC Code 89595-3: L. pneumophila Ag IF Ql (Tiss)

89595-3 is a LOINC code used to identify L. pneumophila Ag IF Ql (Tiss) 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 Tiss.

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 Tiss.

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 Tissue by Immunofluorescence
Legionella pneumophila Ag
Immunofluorescence testing of lung biopsy 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; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; L pneumo; L pneumonphila; Legion; Legionela; Microbiology; Ordinal; Pneu; pneum; Pneumophilia; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Time Resolved Fluorescence; Tissue; Tissue, unspecified; 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 (Tiss)Legionella pneumophila Ag [Presence] in Tissue by ImmunofluorescenceL pneumo Ag Tiss Ql IFLegionella pneumophila AgMICROLegionella pneumophila antigen, TissuePrThr

Frequently asked questions

Code details

Code89595-3
SystemLOINC
Display nameL. pneumophila Ag IF Ql (Tiss)
DescriptionLegionella pneumophila Ag
Short nameL pneumo Ag Tiss Ql IF
ComponentLegionella pneumophila Ag
PropertyPrThr
TimingPt
System (specimen)Tiss
ScaleOrd
MethodIF
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Legionella pneumophila antigen, Tissue

Part names

Legionella pneumophila AgPrThrPtTissOrdIFPresence or ThresholdPoint in time (spot)Tissue and SmearsImmunofluorescence (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 89595-3 | HealthAssure