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.

LOINCActiveObservation

LOINC Code 102478-5: Onion IgE RAST (S) [Presence]

Name: LOINC Code 102478-5: Onion IgE RAST (S) [Presence]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:17.456Z

102478-5 is a LOINC code used to identify Onion IgE RAST (S) [Presence] 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 Allium cepa 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 Allium cepa 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: Observation
Method: RAST

What it does not mean

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

Key facts

Onion IgE Ab [Presence] in Serum by Radioallergosorbent test (RAST)
Allium cepa Ab.IgE
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Allium salota Dostál; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; f048; f48; Immune globulin E; Immunoglobulin E; Onion; Point in time; PR; Radioallergosorbent test; Random; Serum; SmQn; SR

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

Onion IgE RAST (S) [Presence]Onion IgE Ab [Presence] in Serum by Radioallergosorbent test (RAST)Onion IgE RASTAllium cepa Ab.IgEALLERGYOnion allergy testPrThr

Frequently asked questions

Code details

Code102478-5

SystemLOINC

Display nameOnion IgE RAST (S) [Presence]

DescriptionAllium cepa Ab.IgE

Short nameOnion IgE RAST

ComponentAllium cepa Ab.IgE

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodRAST

ClassALLERGY

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.75

Last changed2.75

Consumer names

Onion allergy test

Part names

Allium cepa Ab.IgEPrThrPtSerSemiQnRASTOnion (Allium cepa) IgEPresence or ThresholdPoint in time (spot)SerumRadioallergosorbent test (RAST)

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.