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 98725-5: Voluntary activity.polyphasics of Muscle on EMG

Name: LOINC Code 98725-5: Voluntary activity.polyphasics of Muscle on EMG
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:31.431Z

98725-5 is a LOINC code used to identify Voluntary activity.polyphasics of Muscle on EMG 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 Voluntary activity.polyphasics. It is commonly used with the system or sample type Muscle.

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 Voluntary activity.polyphasics. It is commonly used with the system or sample type Muscle.

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: EMG

What it does not mean

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

Key facts

Voluntary activity.polyphasics of Muscle on EMG

Voluntary activity.polyphasics

The number of phases of a motor unit potential during voluntary activation. The typical number of phases for a healthy muscle is 3-4. Polyphasicity is seen in the early stages of muscle reinnervation as well as muscle disease.[PMID15961866]

Activ; Actvty; Finding; Findings; Movements; Musc; Muscl; NEURO; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen; Volun activity.polyphasics

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

Voluntary activity.polyphasics of Muscle on EMGVolun activity.polyphasics Muscle EMGVoluntary activity.polyphasicsNEUROFindPtMuscle

Frequently asked questions

Code details

Code98725-5

SystemLOINC

Display nameVoluntary activity.polyphasics of Muscle on EMG

DescriptionVoluntary activity.polyphasics

Short nameVolun activity.polyphasics Muscle EMG

ComponentVoluntary activity.polyphasics

PropertyFind

TimingPt

System (specimen)Muscle

ScaleOrd

MethodEMG

ClassNEURO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Part names

Voluntary activity.polyphasicsFindPtMuscleOrdEMGFindingPoint 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.