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 42509-0: H. capsulatum Ab Immune diff Ql (Pleur fld)

Name: LOINC Code 42509-0: H. capsulatum Ab Immune diff Ql (Pleur fld)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

42509-0 is a LOINC code used to identify H. capsulatum Ab Immune diff 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 Histoplasma capsulatum Ab. 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 Histoplasma capsulatum Ab. 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: Immune diffusion

What it does not mean

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

Key facts

Histoplasma capsulatum Ab [Presence] in Pleural fluid by Immune diffusion (ID)
Histoplasma capsulatum Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; H capsul; H capsulatum; H farciminosum; Histo; Histopl; Histoplasma farciminosum; Histoplasmos; Histoplasmosis; ID; Imm; Immunodiff; Immunodiffusion; Imun; Imune; Infectious Disease; InfectiousDisease; Lung; Microbiology; Ordinal; Pleural; Pleural fluid; Point in time; PR; Pulmonary; Pulmonology; Ql; Qual; Qualitative; Random; Respiratory; Screen; thoracentesis fluid

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 H. capsulatum Ab Immune diff Ql (Pleur fld) (42509-0)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

H. capsulatum Ab Immune diff Ql (Pleur fld)Histoplasma capsulatum Ab [Presence] in Pleural fluid by Immune diffusion (ID)H capsul Ab Plr Ql IDHistoplasma capsulatum AbMICROHistoplasma capsulatum antibody, Pleural fluidPrThr

Frequently asked questions

Code details

Code42509-0

SystemLOINC

Display nameH. capsulatum Ab Immune diff Ql (Pleur fld)

DescriptionHistoplasma capsulatum Ab

Short nameH capsul Ab Plr Ql ID

ComponentHistoplasma capsulatum Ab

PropertyPrThr

TimingPt

System (specimen)Plr fld

ScaleOrd

MethodImmune diffusion

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.56

Consumer names

Histoplasma capsulatum antibody, Pleural fluid

Part names

Histoplasma capsulatum AbPrThrPtPlr fldOrdImmune diffusionPresence or ThresholdPoint in time (spot)Pleural fluidImmune diffusion (ID)

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.