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 44634-4: Reason invasive component size cannot be determined Nar (Breast tumor)

Name: LOINC Code 44634-4: Reason invasive component size cannot be determined Nar (Breast tumor)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:30.172Z

44634-4 is a LOINC code used to identify Reason invasive component size cannot be determined Nar (Breast tumor) 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 Reason invasive component size cannot be determined. It is commonly used with the system or sample type Breast tumor.

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 Reason invasive component size cannot be determined. It is commonly used with the system or sample type Breast tumor.

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

What it does not mean

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

Key facts

Reason invasive component size cannot be determined in Breast tumor Narrative
Reason invasive component size cannot be determined
Brst; BT; Cancer; Finding; Findings; Narrative; PATH.HISTO; PATHOLOGY; Point in time; Random; Reas inv comp size not det; Report; tumors; tumour; tumours

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

Reason invasive component size cannot be determined Nar (Breast tumor)Reason invasive component size cannot be determined in Breast tumor NarrativeReas inv comp size not det BTReason invasive component size cannot be determinedPATH.HISTOReason invasive component size cannot be determined, Breast TumorFind

Frequently asked questions

Code details

Code44634-4

SystemLOINC

Display nameReason invasive component size cannot be determined Nar (Breast tumor)

DescriptionReason invasive component size cannot be determined

Short nameReas inv comp size not det BT

ComponentReason invasive component size cannot be determined

PropertyFind

TimingPt

System (specimen)Breast tumor

ScaleNar

ClassPATH.HISTO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.17

Last changed2.61

Consumer names

Reason invasive component size cannot be determined, Breast Tumor

Part names

Reason invasive component size cannot be determinedFindPtBreast tumorNarFindingPoint in time (spot)

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.