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 50031-4: Sulfamethoxazole IgE Qn (S)

Name: LOINC Code 50031-4: Sulfamethoxazole IgE Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.495Z

50031-4 is a LOINC code used to identify Sulfamethoxazole IgE 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 Sulfamethoxazole Ab.IgE. It is commonly used with the system or sample type Ser.

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 Sulfamethoxazole Ab.IgE. 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

What it does not mean

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

Key facts

Sulfamethoxazole IgE Ab [Units/volume] in Serum
Sulfamethoxazole Ab.IgE
ABS; Aby; Acetylsulfamethoxazole; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; c203; c223; C61; Gantanol; Immune globulin E; Immunoglobulin E; Point in time; QNT; Quan; Quant; Quantitative; Random; Serum; SMX; SR; Sulfa; Sulfamethox

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

Sulfamethoxazole IgE Qn (S)Sulfamethoxazole IgE Ab [Units/volume] in SerumSulfamethoxazole IgE QnSulfamethoxazole Ab.IgEALLERGYSulfamethoxazole allergy testACnc

Frequently asked questions

Code details

Code50031-4

SystemLOINC

Display nameSulfamethoxazole IgE Qn (S)

DescriptionSulfamethoxazole Ab.IgE

Short nameSulfamethoxazole IgE Qn

ComponentSulfamethoxazole Ab.IgE

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

Example unitskIU/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Consumer names

Sulfamethoxazole allergy test

Part names

Sulfamethoxazole Ab.IgEACncPtSerQnSulfamethoxazole IgEArbitrary ConcentrationPoint in time (spot)Serum

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.