HealthAssure
HealthAssureGood Life
LOINCActiveBoth

LOINC Code 7429-4: Isocyanate HDI IgE Qn (S)

7429-4 is a LOINC code used to identify Isocyanate HDI IgE Qn (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 Hexamethylene diisocyanate (HDI) Ab.IgE. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Hexamethylene diisocyanate (HDI) 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: Both

What it does not mean

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

Key facts

  • Isocyanate HDI IgE Ab [Units/volume] in Serum
  • Hexamethylene diisocyanate (HDI) Ab.IgE
  • 1,6-diisocyanatohexane; 1,6-hexamethylene diisocyanate; 1,6-hexanediol diisocyanate; 1,6-hexylene diisocyanate; ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; HDI; Hexane 1,6-diisocyanate; HMDI; Immune globulin E; Immunoglobulin E; Isocyanate HDI; k77; Point in time; QNT; Quan; Quant; Quantitative; Random; 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

Isocyanate HDI IgE Qn (S)Isocyanate HDI IgE Ab [Units/volume] in SerumIsocyanate HDI IgE QnHexamethylene diisocyanate (HDI) Ab.IgEALLERGYIsocyanate HDI allergy testACnc

Frequently asked questions

Code details

Code7429-4
SystemLOINC
Display nameIsocyanate HDI IgE Qn (S)
DescriptionHexamethylene diisocyanate (HDI) Ab.IgE
Short nameIsocyanate HDI IgE Qn
ComponentHexamethylene diisocyanate (HDI) Ab.IgE
PropertyACnc
TimingPt
System (specimen)Ser
ScaleQn
ClassALLERGY
Example unitskIU/L
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0h(2)
Last changed2.73

Consumer names

Isocyanate HDI allergy test

Part names

Hexamethylene diisocyanate (HDI) Ab.IgEACncPtSerQnIsocyanate HDI IgEArbitrary ConcentrationPoint 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.