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 41377-3: Knee Extension Active Range of Motion Quantitative

Name: LOINC Code 41377-3: Knee Extension Active Range of Motion Quantitative
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:27.680Z

41377-3 is a LOINC code used to identify Knee Extension Active Range of Motion Quantitative 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 Extension.active range of motion. It is commonly used with the system or sample type Knee.

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 Extension.active range of motion. It is commonly used with the system or sample type Knee.

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

Knee Extension Active Range of Motion Quantitative
Extension.active range of motion
AROM; EXT; Ext AROM; H+P; H+P.PX; Kn; Lower extremity joint; MSK; Musculoskeletal; Ortho; Orthopedics; P prime; Point in time; QNT; Quan; Quant; Quantitative; Random; Rnge

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

Knee Extension Active Range of Motion QuantitativeKnee Ext AROM QnExtension.active range of motionH&P.PXAnglePtKnee

Frequently asked questions

Code details

Code41377-3

SystemLOINC

Display nameKnee Extension Active Range of Motion Quantitative

DescriptionExtension.active range of motion

Short nameKnee Ext AROM Qn

ComponentExtension.active range of motion

PropertyAngle

TimingPt

System (specimen)Knee

ScaleQn

ClassH&P.PX

Example unitsdeg

StatusACTIVE

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.70

Part names

Extension.active range of motionAnglePtKneeQnExtension Active Range of MotionPoint 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.