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 10523-9: Fibrinogen Ag Immune stain Ql (Tiss)

Name: LOINC Code 10523-9: Fibrinogen Ag Immune stain Ql (Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

10523-9 is a LOINC code used to identify Fibrinogen Ag Immune stain Ql (Tiss) 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 Fibrinogen Ag. It is commonly used with the system or sample type Tiss.

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 Fibrinogen Ag. It is commonly used with the system or sample type Tiss.

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: Immune stain

What it does not mean

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

Key facts

Fibrinogen Ag [Presence] in Tissue by Immune stain
Fibrinogen Ag
Antigen; Antigens; COAGULATION; Coagulation factor I; FGN; Hematology; Heme; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; St; Stains; Stn; Tissue; Tissue, unspecified

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Fibrinogen Ag Immune stain Ql (Tiss) (10523-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Fibrinogen Ag Immune stain Ql (Tiss)Fibrinogen Ag [Presence] in Tissue by Immune stainFibrinogen Ag Tiss Ql ImStnFibrinogen AgCOAGFibrinogen antigen, TissuePrThr

Frequently asked questions

Code details

Code10523-9

SystemLOINC

Display nameFibrinogen Ag Immune stain Ql (Tiss)

DescriptionFibrinogen Ag

Short nameFibrinogen Ag Tiss Ql ImStn

ComponentFibrinogen Ag

PropertyPrThr

TimingPt

System (specimen)Tiss

ScaleOrd

MethodImmune stain

ClassCOAG

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0i

Last changed2.73

Consumer names

Fibrinogen antigen, Tissue

Part names

Fibrinogen AgPrThrPtTissOrdImmune stainPresence or ThresholdPoint in time (spot)Tissue and Smears

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.