LOINC Code 71793-4: T. pallidum Ab Aggl [Titer]

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 Ser/Plas.

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: Aggl

What it does not mean

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

Key facts

• Treponema pallidum Ab [Titer] in Serum or Plasma by Agglutination
• Treponema pallidum Ab
• Identification of Treponema pallidum antibodies by particle agglutination is performed for the diagnosis of syphilis caused by T. pallidum. This code was created for a test that uses the same treponemal antigen as hemagglutination tests (MHA-TP) but with gelatin particles, allowing for testing with serum or plasma samples.
• ABS; Aby; Agg; Agglut; Agglutination; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); ID; Infectious Disease; InfectiousDisease; Microbiology; Pl; Plasma; Plsm; Point in time; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SmQn; SR; Syphilis; T palldm; T pallidum; Titer; Titered; Titre; TP-PA; Treponemal; Ttr

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

Related observations and tests

Common synonyms

Frequently asked questions