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 66339-3: How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [PhenX]

Name: LOINC Code 66339-3: How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:45.459Z

66339-3 is a LOINC code used to identify How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [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 How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks. It is commonly used with the system or sample type ^Patient.

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 How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks. It is commonly used with the system or sample type ^Patient.

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

How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [PhenX]
How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks
Finding; Findings; II; III; Ordinal; Point in time; QL; Qual; Qualitative; Random; Screen; Walking quarter mile

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

How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [PhenX]Walking quarter mile PhenXHow much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocksPHENXFindPt^Patient

Frequently asked questions

Code details

Code66339-3

SystemLOINC

Display nameHow much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks [PhenX]

DescriptionHow much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks

Short nameWalking quarter mile PhenX

ComponentHow much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocks

PropertyFind

TimingPt

System (specimen)^Patient

ScaleOrd

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.72

Part names

How much difficulty do you have walking for a quarter of a mile, that is about 2 or 3 blocksFindPt^PatientOrdPhenXFindingPoint 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.