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 7549-9: Onion triggered histamine release Qn (Bld)

Name: LOINC Code 7549-9: Onion triggered histamine release Qn (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:55.159Z

7549-9 is a LOINC code used to identify Onion triggered histamine release Qn (Bld) 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 basophil bound Ab. It is commonly used with the system or sample type Bld.

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 basophil bound Ab. It is commonly used with the system or sample type Bld.

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: LHR

What it does not mean

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

Key facts

Onion triggered histamine release [Units/volume] in Blood
Allium cepa basophil bound Ab
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Allium salota Dostál; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Associated; Autoantibodies; Autoantibody; Baso; BasoBnd Ab; Basophil release; Basophils; Basos; Blood; bnd; Bph; f048; f48; Leukocyte histamine reaction; Leukocyte histamine release; Onion; Point in time; QNT; Quan; Quant; Quantitative; Random; WB; WBC release; Whole blood

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 triggered histamine release Qn (Bld)Onion triggered histamine release [Units/volume] in BloodOnion BasoBnd Ab QnAllium cepa basophil bound AbALLERGYOnion triggered histamine release, BloodACnc

Frequently asked questions

Code details

Code7549-9

SystemLOINC

Display nameOnion triggered histamine release Qn (Bld)

DescriptionAllium cepa basophil bound Ab

Short nameOnion BasoBnd Ab Qn

ComponentAllium cepa basophil bound Ab

PropertyACnc

TimingPt

System (specimen)Bld

ScaleQn

MethodLHR

ClassALLERGY

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0h(2)

Last changed2.69

Consumer names

Onion triggered histamine release, Blood

Part names

Allium cepa basophil bound AbACncPtBldQnLHROnion (Allium cepa) basophil bound AbArbitrary ConcentrationPoint in time (spot)BloodLeukocyte histamine release

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.