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.

LOINC

LOINC Code 66534-9: Percentage area affected by eczema Lower extremity - bilateral [PhenX]

Name: LOINC Code 66534-9: Percentage area affected by eczema Lower extremity - bilateral [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:46.210Z

66534-9 is a LOINC code used to identify Percentage area affected by eczema Lower extremity - bilateral [PhenX] 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 Percentage area affected by eczema. It is commonly used with the system or sample type Lower extremity.bilateral.

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 Percentage area affected by eczema. It is commonly used with the system or sample type Lower extremity.bilateral.

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: TRIAL
Method: PhenX

What it does not mean

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

Key facts

Percentage area affected by eczema Lower extremity - bilateral [PhenX]
Percentage area affected by eczema
Bil; Bilat; Both; Count/time; EXT; Extr-Bl; LE; LE-Bl; Leg; Low; nRate; Number rate; Number Rate = Count/Time; Point in time; QNT; Quan; Quant; Quantitative; Random

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

Percentage area affected by eczema Lower extremity - bilateral [PhenX]Area affected by eczema LE-Bl PhenXPercentage area affected by eczemaPHENXNRatPtLower extremity.bilateral

Frequently asked questions

Code details

Code66534-9

SystemLOINC

Display namePercentage area affected by eczema Lower extremity - bilateral [PhenX]

DescriptionPercentage area affected by eczema

Short nameArea affected by eczema LE-Bl PhenX

ComponentPercentage area affected by eczema

PropertyNRat

TimingPt

System (specimen)Lower extremity.bilateral

ScaleQn

MethodPhenX

ClassPHENX

Example units%

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.65

Part names

Percentage area affected by eczemaNRatPtLower extremity.bilateralQnPhenXNumber RatePoint in time (spot)Lower extremity Bilateral

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.