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 20757-1: Chlamydia sp Ag IF Ql (Tiss)

Name: LOINC Code 20757-1: Chlamydia sp Ag IF Ql (Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

20757-1 is a LOINC code used to identify Chlamydia sp 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 Chlamydia sp Ag. It is commonly used with the system or sample type Tiss.

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 Chlamydia sp 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

Chlamydia sp Ag [Presence] in Tissue by Immunofluorescence
Chlamydia sp Ag
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Chlam; Chlamid; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; species; spp; 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Chlamydia sp Ag IF Ql (Tiss) (20757-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Chlamydia sp Ag IF Ql (Tiss)Chlamydia sp Ag [Presence] in Tissue by ImmunofluorescenceChlamydia Ag Tiss Ql IFChlamydia sp AgMICROChlamydia sp antigen, TissuePrThr

Frequently asked questions

Code details

Code20757-1

SystemLOINC

Display nameChlamydia sp Ag IF Ql (Tiss)

DescriptionChlamydia sp Ag

Short nameChlamydia Ag Tiss Ql IF

ComponentChlamydia sp Ag

PropertyPrThr

TimingPt

System (specimen)Tiss

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.56

Consumer names

Chlamydia sp antigen, Tissue

Part names

Chlamydia sp 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.