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.

LOINCBoth

LOINC Code 48318-0: Cat hair+Cat epithelium IgE RAST class (S)

Name: LOINC Code 48318-0: Cat hair+Cat epithelium IgE RAST class (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.165Z

48318-0 is a LOINC code used to identify Cat hair+Cat epithelium 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 Cat hair+Cat epithelium 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 Cat hair+Cat epithelium 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: Both

What it does not mean

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

Key facts

Deprecated Cat hair + Cat dander IgE Ab RAST class in Serum
Cat hair+Cat epithelium Ab.IgE.RAST class
We reviewed the major allergy testing manufacturers and found that they all use the same allergen code, e1, but use different test descriptions (dander, epithelium, hair)
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Epithelia; Feline; Felis domesticus; IgE RAST; Immune globulin E; Immunoglobulin E; Ordinal; Point in time; 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

Cat hair+Cat epithelium IgE RAST class (S)Deprecated Cat hair + Cat dander IgE Ab RAST class in SerumDeprecated Cat Hair+Epith IgE RAST QlCat hair+Cat epithelium Ab.IgE.RAST classALLERGYCat Hair+Cat Epithelium allergy testACnc

Frequently asked questions

Code details

Code48318-0

SystemLOINC

Display nameCat hair+Cat epithelium IgE RAST class (S)

DescriptionCat hair+Cat epithelium Ab.IgE.RAST class

Short nameDeprecated Cat Hair+Epith IgE RAST Ql

ComponentCat hair+Cat epithelium Ab.IgE.RAST class

PropertyACnc

TimingPt

System (specimen)Ser

ScaleOrd

ClassALLERGY

StatusDEPRECATED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.21

Last changed2.36

Consumer names

Cat Hair+Cat Epithelium allergy test

Part names

Cat hair+Cat epithelium Ab.IgE.RAST classACncPtSerOrdArbitrary 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.