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 102704-4: Casein IgG RAST (S) [Presence]

Name: LOINC Code 102704-4: Casein IgG RAST (S) [Presence]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:17.457Z

102704-4 is a LOINC code used to identify Casein IgG RAST (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 Casein Ab.IgG. 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 Casein Ab.IgG. 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: RAST

What it does not mean

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

Key facts

Casein IgG Ab [Presence] in Serum by Radioallergosorbent test (RAST)
Casein Ab.IgG
a167; ABS; Aby; Agf78; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; f078; f78; Immune globulin G; Immunoglobulin G; nBos d 8; Point in time; PR; Radioallergosorbent test; Random; Serum; SmQn; 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

Casein IgG RAST (S) [Presence]Casein IgG Ab [Presence] in Serum by Radioallergosorbent test (RAST)Casein IgG RASTCasein Ab.IgGALLERGYCasein IgG antibodyPrThr

Frequently asked questions

Code details

Code102704-4

SystemLOINC

Display nameCasein IgG RAST (S) [Presence]

DescriptionCasein Ab.IgG

Short nameCasein IgG RAST

ComponentCasein Ab.IgG

PropertyPrThr

TimingPt

System (specimen)Ser

ScaleSemiQn

MethodRAST

ClassALLERGY

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.75

Last changed2.75

Consumer names

Casein IgG antibody

Part names

Casein Ab.IgGPrThrPtSerSemiQnRASTCasein IgGPresence or ThresholdPoint in time (spot)SerumRadioallergosorbent test (RAST)

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.