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 66664-4: Venous thrombosis with swelling, ulceration, or venous stasis [PhenX]

Name: LOINC Code 66664-4: Venous thrombosis with swelling, ulceration, or venous stasis [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:46.211Z

66664-4 is a LOINC code used to identify Venous thrombosis with swelling, ulceration, or venous stasis [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 Venous thrombosis with swelling, ulceration, or venous stasis. 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 Venous thrombosis with swelling, ulceration, or venous stasis. 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

Venous thrombosis with swelling, ulceration, or venous stasis [PhenX]
Venous thrombosis with swelling, ulceration, or venous stasis
History; 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

Venous thrombosis with swelling, ulceration, or venous stasis [PhenX]Venous thrombosis PhenXVenous thrombosis with swelling, ulceration, or venous stasisPHENXHxPt^Patient

Frequently asked questions

Code details

Code66664-4

SystemLOINC

Display nameVenous thrombosis with swelling, ulceration, or venous stasis [PhenX]

DescriptionVenous thrombosis with swelling, ulceration, or venous stasis

Short nameVenous thrombosis PhenX

ComponentVenous thrombosis with swelling, ulceration, or venous stasis

PropertyHx

TimingPt

System (specimen)^Patient

ScaleOrd

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.65

Part names

Venous thrombosis with swelling, ulceration, or venous stasisHxPt^PatientOrdPhenXHistoryPoint 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.