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.

LOINCActiveObservation

LOINC Code 20353-9: Region of interest Pressure gradient by US.doppler

Name: LOINC Code 20353-9: Region of interest Pressure gradient by US.doppler
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.847Z

20353-9 is a LOINC code used to identify Region of interest Pressure gradient by US.doppler 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 Pressure gradient. It is commonly used with the system or sample type Region of interest.XXX.

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 Pressure gradient. It is commonly used with the system or sample type Region of interest.XXX.

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: Observation
Method: US.doppler

What it does not mean

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

Key facts

Region of interest Pressure gradient by US.doppler
Pressure gradient
CARD.US; Cardio; Cardiology; DOP; DUPLEX; Echography; Grad; Heart Disease; Misc; Miscellaneous; Other; Point in time; Press grad; QNT; Quan; Quant; Quantitative; Random; ROI; Sonogram; Sonograph; Sonography; Spec; To be specified in another part of the message; ULS; Ultrasound; Unspecified

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

Region of interest Pressure gradient by US.dopplerROI Press grad DOPPressure gradientCARD.USPressDiffPtRegion of interest.XXX

Frequently asked questions

Code details

Code20353-9

SystemLOINC

Display nameRegion of interest Pressure gradient by US.doppler

DescriptionPressure gradient

Short nameROI Press grad DOP

ComponentPressure gradient

PropertyPressDiff

TimingPt

System (specimen)Region of interest.XXX

ScaleQn

MethodUS.doppler

ClassCARD.US

Example unitsmm Hg

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.67

Part names

Pressure gradientPressDiffPtRegion of interest.XXXQnUS.dopplerPressure DifferencePoint in time (spot)Region of interest XXXUltrasound.doppler

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.