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 39534-3: Cryptosporidium sp Ag IF Ql (Stl)

Name: LOINC Code 39534-3: Cryptosporidium sp Ag IF Ql (Stl)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

39534-3 is a LOINC code used to identify Cryptosporidium sp Ag IF Ql (Stl) 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 Cryptosporidium sp Ag. It is commonly used with the system or sample type Stool.

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 Cryptosporidium sp Ag. It is commonly used with the system or sample type Stool.

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

Cryptosporidium sp Ag [Presence] in Stool by Immunofluorescence
Cryptosporidium sp Ag
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Bowel movement; Crypt; Crypto; Cryptosporidiosis; DFA; FA; Faecal; Faeces; Fecal; Feces; Fluorescent antibody; Fluoresent; Gastro; Gastroenterology; GI; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; species; spp; Stl; Stool = Fecal; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Cryptosporidium sp Ag IF Ql (Stl) (39534-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Cryptosporidium sp Ag IF Ql (Stl)Cryptosporidium sp Ag [Presence] in Stool by ImmunofluorescenceCryptosp Ag Stl Ql IFCryptosporidium sp AgMICROCryptosporidium sp antigen, StoolPrThr

Frequently asked questions

Code details

Code39534-3

SystemLOINC

Display nameCryptosporidium sp Ag IF Ql (Stl)

DescriptionCryptosporidium sp Ag

Short nameCryptosp Ag Stl Ql IF

ComponentCryptosporidium sp Ag

PropertyPrThr

TimingPt

System (specimen)Stool

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.73

Consumer names

Cryptosporidium sp antigen, Stool

Part names

Cryptosporidium sp AgPrThrPtStoolOrdIFPresence or ThresholdPoint in time (spot)Immunofluorescence (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.