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 50314-4: Cytokeratin 19 Ag Immune stain Ql (Tiss)

Name: LOINC Code 50314-4: Cytokeratin 19 Ag Immune stain Ql (Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.495Z

50314-4 is a LOINC code used to identify Cytokeratin 19 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 Cytokeratin 19 Ag. It is commonly used with the system or sample type Tiss.

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 Cytokeratin 19 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

Cytokeratin 19 Ag [Presence] in Tissue by Immune stain
Cytokeratin 19 Ag
Antigen; Antigens; Autoimmune hepatitis; CK; CK 19; Cyfra 21-1; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Keratin 19; Keratin, type I cytoskeletal 19; Ordinal; PATHOLOGY; 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.

Common synonyms

Cytokeratin 19 Ag Immune stain Ql (Tiss)Cytokeratin 19 Ag [Presence] in Tissue by Immune stainCK 19 Ag Tiss Ql ImStnCytokeratin 19 AgPATHCytokeratin 19 antigen, TissuePrThr

Frequently asked questions

Code details

Code50314-4

SystemLOINC

Display nameCytokeratin 19 Ag Immune stain Ql (Tiss)

DescriptionCytokeratin 19 Ag

Short nameCK 19 Ag Tiss Ql ImStn

ComponentCytokeratin 19 Ag

PropertyPrThr

TimingPt

System (specimen)Tiss

ScaleOrd

MethodImmune stain

ClassPATH

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.73

Consumer names

Cytokeratin 19 antigen, Tissue

Part names

Cytokeratin 19 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.