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 100164-3: Knee AP instability W 90 degree flexion

Name: LOINC Code 100164-3: Knee AP instability W 90 degree flexion
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:16.530Z

100164-3 is a LOINC code used to identify Knee AP instability W 90 degree flexion 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 Anterior-posterior instability^W 90 degree flexion. 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 Anterior-posterior instability^W 90 degree flexion. 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
Order vs observation: Both
Method: Measured

What it does not mean

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

Key facts

Knee AP instability W 90 degree flexion
Anterior-posterior instability^W 90 degree flexion
AP instability; AP instability^W 90 degree flexion; CLIN; Finding; Findings; Kn; Lower extremity joint; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen

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 AP instability W 90 degree flexionKnee AP instability W 90 deg flexAnterior-posterior instability^W 90 degree flexionCLINFindPtKnee

Frequently asked questions

Code details

Code100164-3

SystemLOINC

Display nameKnee AP instability W 90 degree flexion

DescriptionAnterior-posterior instability^W 90 degree flexion

Short nameKnee AP instability W 90 deg flex

ComponentAnterior-posterior instability^W 90 degree flexion

PropertyFind

TimingPt

System (specimen)Knee

ScaleOrd

MethodMeasured

ClassCLIN

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.73

Last changed2.73

Consumer names

Knee AP instability W 90 degree flexion

Part names

Anterior-posterior instability^W 90 degree flexionFindPtKneeOrdMeasuredFindingPoint 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.