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 84905-9: Margin involvement Nom (Prostate tumor)

Name: LOINC Code 84905-9: Margin involvement Nom (Prostate tumor)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:11.791Z

84905-9 is a LOINC code used to identify Margin involvement Nom (Prostate 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 Margin involvement. It is commonly used with the system or sample type Prostate 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 Margin involvement. It is commonly used with the system or sample type Prostate 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

Margin involvement [Type] in Prostate tumor

Margin involvement

The type of positive margin involvement in prostate tumor is either extraprostatic extension (EPE) or intraprostatic (capsular incision). Margin involvement associated with EPE is diagnosed when malignant glands in extraprostatic tissue are transected by the resection margin. Intraprostatic margin involvement occurs when the urologist inadvertently develops the resection margin within the plane of the prostate rather than outside the capsule. Intraprostatic with a positive surgical margin is diagnosed when malignant glands are cut across adjacent to benign prostatic glands. In these cases, the edge of the prostate in this region is left in the patient. According to the largest series published, a significantly higher recurrence rate is found in patients with CI/intraprostatic margin involvement than in patients with organ confined disease with negative margins, or focal EPE with negative margins, although CI has a significantly better outcome than that associated with non-focal EPE and positive margins.[PMID17698141] This term was created for, but not limited in use to, the Royal College of Pathologists of Australasia (RCPA) Prostate cancer structured reporting protocol, 2nd edition (2014).

Cancer; Margin involved; Nominal; Pathology; Point in time; Prost; Prostatic; PrT; Random; tumors; tumour; tumours; Typ

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

Margin involvement Nom (Prostate tumor)Margin involvement [Type] in Prostate tumorMargin involved PrTMargin involvementPATHMargin involvement, Prostate TumorType

Frequently asked questions

Code details

Code84905-9

SystemLOINC

Display nameMargin involvement Nom (Prostate tumor)

DescriptionMargin involvement

Short nameMargin involved PrT

ComponentMargin involvement

PropertyType

TimingPt

System (specimen)Prostate tumor

ScaleNom

ClassPATH

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.58

Last changed2.71

Consumer names

Margin involvement, Prostate Tumor

Part names

Margin involvementTypePtProstate tumorNomPoint 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.