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 91861-5: C. trachomatis Ag IF Ql (Asp)

Name: LOINC Code 91861-5: C. trachomatis Ag IF Ql (Asp)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:21.442Z

91861-5 is a LOINC code used to identify C. trachomatis Ag IF Ql (Asp) 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 trachomatis Ag. It is commonly used with the system or sample type Asp.

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 Chlamydia trachomatis Ag. It is commonly used with the system or sample type Asp.

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 trachomatis Ag [Presence] in Aspirate by Immunofluorescence
Chlamydia trachomatis Ag
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Aspirate; C trac; C trach; C tracho; C trachomatis; Chlam; Chlam trac; Chlamid; CT; DFA; FA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; LGV; Lymphogranuloma venereum; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Time Resolved Fluorescence; Trachoma; 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

C. trachomatis Ag IF Ql (Asp)Chlamydia trachomatis Ag [Presence] in Aspirate by ImmunofluorescenceC trach Ag Aspirate Ql IFChlamydia trachomatis AgMICROChlamydia trachomatis antigen, AspiratePrThr

Frequently asked questions

Code details

Code91861-5

SystemLOINC

Display nameC. trachomatis Ag IF Ql (Asp)

DescriptionChlamydia trachomatis Ag

Short nameC trach Ag Aspirate Ql IF

ComponentChlamydia trachomatis Ag

PropertyPrThr

TimingPt

System (specimen)Asp

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.66

Last changed2.66

Consumer names

Chlamydia trachomatis antigen, Aspirate

Part names

Chlamydia trachomatis AgPrThrPtAspOrdIFPresence or ThresholdPoint in time (spot)AspirateImmunofluorescence (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.