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.

LOINCObservation

LOINC Code 21272-0: Fireweed IgE RAST class (S)

Name: LOINC Code 21272-0: Fireweed IgE RAST class (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.460Z

21272-0 is a LOINC code used to identify Fireweed IgE RAST class (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 Chamerion angustifolium Ab.IgE.RAST class. 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 Chamerion angustifolium Ab.IgE.RAST class. 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: DEPRECATED
Order vs observation: Observation

What it does not mean

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

Key facts

Deprecated Fireweed IgE Ab RAST class [Presence] in Serum
Chamerion angustifolium Ab.IgE.RAST class
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; C angustifolium; E augustifolium; Epilobium augustifolium; Fireweed; IgE RAST; Immune globulin E; Immunoglobulin E; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Serum; 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

Fireweed IgE RAST class (S)Deprecated Fireweed IgE Ab RAST class [Presence] in SerumDeprecated Fireweed IgE RAST QlChamerion angustifolium Ab.IgE.RAST classALLERGYFireweed allergy testPrThr

Frequently asked questions

Code details

Code21272-0

SystemLOINC

Display nameFireweed IgE RAST class (S)

DescriptionChamerion angustifolium Ab.IgE.RAST class

Short nameDeprecated Fireweed IgE RAST Ql

ComponentChamerion angustifolium Ab.IgE.RAST class

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleOrd

ClassALLERGY

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.75

Consumer names

Fireweed allergy test

Part names

Chamerion angustifolium Ab.IgE.RAST classPrThrPtSerOrdPresence or ThresholdPoint 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.