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 17727-9: T. pallidum IgG IF Qn (S)

Name: LOINC Code 17727-9: T. pallidum IgG IF Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

17727-9 is a LOINC code used to identify T. pallidum IgG IF Qn (S) 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 Treponema pallidum Ab.IgG. It is commonly used with the system or sample type Ser.

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 Treponema pallidum Ab.IgG. It is commonly used with the system or sample type Ser.

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

Treponema pallidum IgG Ab [Units/volume] in Serum by Immunofluorescence
Treponema pallidum Ab.IgG
ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Arbitrary concentration; Autoantibodies; Autoantibody; FA; Fluorescent antibody; Fluorescent treponemal antibody; Fluoresent; FTA-ABS; ID; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SR; Syphilis; T palldm; T pallidum; Time Resolved Fluorescence; Treponemal; 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 T. pallidum IgG IF Qn (S) (17727-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

T. pallidum IgG IF Qn (S)Treponema pallidum IgG Ab [Units/volume] in Serum by ImmunofluorescenceT palldm IgG Ser IF-aCncTreponema pallidum Ab.IgGMICROTreponema pallidum IgG antibody, BloodACnc

Frequently asked questions

Code details

Code17727-9

SystemLOINC

Display nameT. pallidum IgG IF Qn (S)

DescriptionTreponema pallidum Ab.IgG

Short nameT palldm IgG Ser IF-aCnc

ComponentTreponema pallidum Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.82

Consumer names

Treponema pallidum IgG antibody, Blood

Part names

Treponema pallidum Ab.IgGACncPtSerQnIFTreponema pallidum IgGArbitrary ConcentrationPoint in time (spot)SerumImmunofluorescence (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.