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 49800-6: T. pallidum Ab HA Qn (CSF)

Name: LOINC Code 49800-6: T. pallidum Ab HA Qn (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.943Z

49800-6 is a LOINC code used to identify T. pallidum Ab HA Qn (CSF) 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. It is commonly used with the system or sample type CSF.

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

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: HA

What it does not mean

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

Key facts

Treponema pallidum Ab [Units/volume] in Cerebral spinal fluid by Hemagglutination
Treponema pallidum Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; HATTS; Hemagglutination; ID; IHA; Infectious Disease; InfectiousDisease; MHA-TP; Microbiology; Neuro; Neurology; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Syphilis; T palldm; T pallidum; TPHA; Treponemal

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

T. pallidum Ab HA Qn (CSF)Treponema pallidum Ab [Units/volume] in Cerebral spinal fluid by HemagglutinationT palldm Ab CSF HA-aCncTreponema pallidum AbMICROTreponema pallidum antibody, Spinal fluidACnc

Frequently asked questions

Code details

Code49800-6

SystemLOINC

Display nameT. pallidum Ab HA Qn (CSF)

DescriptionTreponema pallidum Ab

Short nameT palldm Ab CSF HA-aCnc

ComponentTreponema pallidum Ab

PropertyACnc

TimingPt

System (specimen)CSF

ScaleQn

MethodHA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.82

Consumer names

Treponema pallidum antibody, Spinal fluid

Part names

Treponema pallidum AbACncPtCSFQnHAArbitrary ConcentrationPoint in time (spot)Cerebral spinal fluidHemagglutination

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.