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 82039-9: Common ragweed+Western ragweed+Giant ragweed IgE RAST class Multidisk (S) [Presence]

Name: LOINC Code 82039-9: Common ragweed+Western ragweed+Giant ragweed IgE RAST class Multidisk (S) [Presence]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:05.776Z

82039-9 is a LOINC code used to identify Common ragweed+Western ragweed+Giant ragweed IgE RAST class Multidisk (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 (Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) 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 (Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) 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: ACTIVE
Order vs observation: Observation
Method: Multidisk

What it does not mean

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

Key facts

Weed Allergen Mix 209 (Common ragweed+Western ragweed+Giant ragweed) IgE Ab RAST class [Presence] in Serum by Multidisk
(Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) Ab.IgE.RAST class
A artemisiifolia; A elatior; ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Allerscan; Ambrosia artemisiifolia; Ambrosia trifida Ab.IgE.RAST class; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Common ragweed; Giant Ragweed; IgE RAST; Immune globulin E; Immunoglobulin E; Point in time; PR; Random; Rw209; Serum; Short ragweed; SmQn; SR; w001; w002; w003; w1; w2; w209; w3; Weed Allerg Mix209; West Ragweed; Western ragweed; wx209

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

Common ragweed+Western ragweed+Giant ragweed IgE RAST class Multidisk (S) [Presence]Weed Allergen Mix 209 (Common ragweed+Western ragweed+Giant ragweed) IgE Ab RAST class [Presence] in Serum by MultidiskWeed Allerg Mix209 IgE RAST(Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) Ab.IgE.RAST classALLERGYWeed mix (Common Ragweed, Western Ragweed, Giant Ragweed) allergy testPrThr

Frequently asked questions

Code details

Code82039-9

SystemLOINC

Display nameCommon ragweed+Western ragweed+Giant ragweed IgE RAST class Multidisk (S) [Presence]

Description(Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) Ab.IgE.RAST class

Short nameWeed Allerg Mix209 IgE RAST

Component(Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) Ab.IgE.RAST class

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodMultidisk

ClassALLERGY

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.75

Consumer names

Weed mix (Common Ragweed, Western Ragweed, Giant Ragweed) allergy test

Part names

(Ambrosia elatior+Ambrosia psilostachya+Ambrosia trifida) Ab.IgE.RAST classPrThrPtSerSemiQnMultidiskPresence 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.