LOINCActiveObservation

LOINC Code 93803-5: Chr 19 polysomy FISH Ql (Tiss)

93803-5 is a LOINC code used to identify Chr 19 polysomy FISH 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 Chromosome 19 polysomy. 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 Chromosome 19 polysomy. 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: Observation
  • Method: FISH

What it does not mean

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

Key facts

Chromosome 19 polysomy [Presence] in Tissue by FISH
Chromosome 19 polysomy
This test determines if chromosome 19 polysomy is present in tissue (tumor) specimens. Polysomy is defined as 3 or more signals for 1q and/or 19p in >30% of tumor cells with concurrent 1p/19q deletion.[PMID19808867] Chromosome 19 polysomy is a prognostic indicator of poorer outcome for oligodendroglioma patients.
Chr 19 polysomy; Chromosom; Chromosomes; Fluorescent in situ hybridization; Molecular pathology; MOLPATH; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; 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

Chr 19 polysomy FISH Ql (Tiss)Chromosome 19 polysomy [Presence] in Tissue by FISHChr 19 polysomy Tiss Ql FISHChromosome 19 polysomyMOLPATHChromosome 19 polysomy, TissuePrThr

Frequently asked questions

Code details

Code93803-5
SystemLOINC
Display nameChr 19 polysomy FISH Ql (Tiss)
DescriptionChromosome 19 polysomy
Short nameChr 19 polysomy Tiss Ql FISH
ComponentChromosome 19 polysomy
PropertyPrThr
TimingPt
System (specimen)Tiss
ScaleOrd
MethodFISH
ClassMOLPATH
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.67
Last changed2.67

Consumer names

Chromosome 19 polysomy, Tissue

Part names

Chromosome 19 polysomyPrThrPtTissOrdFISHPresence or ThresholdPoint in time (spot)Tissue and SmearsFluorescent in situ hybridization (FISH)

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.