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.

LOINCActive

LOINC Code 21955-0: Source of protocol in which patient enrolled Cancer

Name: LOINC Code 21955-0: Source of protocol in which patient enrolled Cancer
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:30.107Z

21955-0 is a LOINC code used to identify Source of protocol in which patient enrolled Cancer 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 Source of protocol in which patient enrolled. It is commonly used with the system or sample type Cancer.XXX.

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 Source of protocol in which patient enrolled. It is commonly used with the system or sample type Cancer.XXX.

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

What it does not mean

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

Key facts

Source of protocol in which patient enrolled Cancer
Source of protocol in which patient enrolled
The NAACCR UDSC approved to retire this data item in Version 11... NAACCR Data Standards and Data Dictionary Version 11
CA; Misc; Miscellaneous; Nominal; Oncology; Other; Point in time; Random; Source protocol patient enrolled; Spec; Srce; To be specified in another part of the message; TUMOR REGISTRY(NAACCR); Typ; 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

Source of protocol in which patient enrolled CancerSource protocol patient enrolled CancerSource of protocol in which patient enrolledTUMRRGTTypePtCancer.XXX

Frequently asked questions

Code details

Code21955-0

SystemLOINC

Display nameSource of protocol in which patient enrolled Cancer

DescriptionSource of protocol in which patient enrolled

Short nameSource protocol patient enrolled Cancer

ComponentSource of protocol in which patient enrolled

PropertyType

TimingPt

System (specimen)Cancer.XXX

ScaleNom

ClassTUMRRGT

StatusACTIVE

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.29

Part names

Source of protocol in which patient enrolledTypePtCancer.XXXNomPoint in time (spot)Cancer XXX

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.