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 7740-4: Tobacco triggered histamine release Qn (Bld)

Name: LOINC Code 7740-4: Tobacco triggered histamine release Qn (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:57.648Z

7740-4 is a LOINC code used to identify Tobacco 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 Nicotiana tabacum 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 Nicotiana tabacum 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

Tobacco triggered histamine release [Units/volume] in Blood
Nicotiana tabacum basophil bound Ab
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Associated; Autoantibodies; Autoantibody; Baso; BasoBnd Ab; Basophil release; Basophils; Basos; Blood; bnd; Bph; Leukocyte histamine reaction; Leukocyte histamine release; o201; Point in time; QNT; Quan; Quant; Quantitative; Random; Ro201; Tobacco; Tobacco dust; Tobacco leaf; 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

Tobacco triggered histamine release Qn (Bld)Tobacco triggered histamine release [Units/volume] in BloodTobacco BasoBnd Ab QnNicotiana tabacum basophil bound AbALLERGYTobacco triggered histamine release, BloodACnc

Frequently asked questions

Code details

Code7740-4

SystemLOINC

Display nameTobacco triggered histamine release Qn (Bld)

DescriptionNicotiana tabacum basophil bound Ab

Short nameTobacco BasoBnd Ab Qn

ComponentNicotiana tabacum 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

Tobacco triggered histamine release, Blood

Part names

Nicotiana tabacum basophil bound AbACncPtBldQnLHRTobacco (Nicotiana tabacum) 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.