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 20925-4: Ova and parasites identified McMaster concentration Nom (Stl)

Name: LOINC Code 20925-4: Ova and parasites identified McMaster concentration Nom (Stl)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.457Z

20925-4 is a LOINC code used to identify Ova and parasites identified McMaster concentration Nom (Stl) 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 Ova & parasites. It is commonly used with the system or sample type Stool.

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 Ova & parasites. It is commonly used with the system or sample type Stool.

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: Concentration.McMaster

What it does not mean

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

Key facts

Ova and parasites identified in Stool by McMaster concentration
Ova & parasites
Bowel movement; Cnc; Conc; Faecal; Faeces; Fecal; Feces; Gastro; Gastroenterology; GI; ID; Identity or presence; Infectious Disease; InfectiousDisease; McMaster Conc; Microbiology; Nominal; O&P; O+P; Ova and parasite; Ovum; Parasite; Point in time; Random; Stl; Stool = Fecal

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

Ova and parasites identified McMaster concentration Nom (Stl)Ova and parasites identified in Stool by McMaster concentrationO+P Stl McMaster ConcOva & parasitesMICROOva and Parasites test, StoolPrid

Frequently asked questions

Code details

Code20925-4

SystemLOINC

Display nameOva and parasites identified McMaster concentration Nom (Stl)

DescriptionOva & parasites

Short nameO+P Stl McMaster Conc

ComponentOva & parasites

PropertyPrid

TimingPt

System (specimen)Stool

ScaleNom

MethodConcentration.McMaster

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.78

Consumer names

Ova and Parasites test, Stool

Part names

Ova & parasitesPridPtStoolNomConcentration.McMasterOva and parasitesPresence or IdentityPoint in time (spot)McMaster concentration

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.