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LOINC Code 38461-0: Legionella sp Ag IF Ql (Pleur fld)

38461-0 is a LOINC code used to identify Legionella sp Ag IF Ql (Pleur fld) 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 sp Ag. It is commonly used with the system or sample type Plr fld.

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 Legionella sp Ag. It is commonly used with the system or sample type Plr fld.

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 sp Ag [Presence] in Pleural fluid by Immunofluorescence
  • Legionella sp Ag
  • ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Legion; Legionela; Lung; Microbiology; Ordinal; Pleural; Pleural fluid; Point in time; PR; Pulmonary; Pulmonology; Ql; Qual; Qualitative; Random; Respiratory; Screen; species; spp; thoracentesis fluid; 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

Legionella sp Ag IF Ql (Pleur fld)Legionella sp Ag [Presence] in Pleural fluid by ImmunofluorescenceLegionella Ag Plr Ql IFLegionella sp AgMICROLegionella sp antigen, Pleural fluidPrThr

Frequently asked questions

Code details

Code38461-0
SystemLOINC
Display nameLegionella sp Ag IF Ql (Pleur fld)
DescriptionLegionella sp Ag
Short nameLegionella Ag Plr Ql IF
ComponentLegionella sp Ag
PropertyPrThr
TimingPt
System (specimen)Plr fld
ScaleOrd
MethodIF
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.14
Last changed2.56

Consumer names

Legionella sp antigen, Pleural fluid

Part names

Legionella sp AgPrThrPtPlr fldOrdIFPresence or ThresholdPoint in time (spot)Pleural fluidImmunofluorescence (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.