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 29453-8: Pulmonary vein Maximum A wave reversal by US.doppler

Name: LOINC Code 29453-8: Pulmonary vein Maximum A wave reversal by US.doppler
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:15.474Z

29453-8 is a LOINC code used to identify Pulmonary vein Maximum A wave reversal 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 A wave reversal.max. It is commonly used with the system or sample type Pulmonary vein.

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 A wave reversal.max. It is commonly used with the system or sample type Pulmonary vein.

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

Pulmonary vein Maximum A wave reversal by US.doppler
A wave reversal.max
Atrial wave; A-wave; A-wave reversal; A-wave reversal.max; CARD.US; Cardio; Cardiology; DOP; DUPLEX; Echography; Heart Disease; Largest; Max V; Maximal; Maximum; Peak; Point in time; Pulm v; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; V max; Velocity; Ven; Venous; Vmax

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

Pulmonary vein Maximum A wave reversal by US.dopplerPulm v A-wave reversal.max DOPA wave reversal.maxCARD.USVelPtPulmonary vein

Frequently asked questions

Code details

Code29453-8

SystemLOINC

Display namePulmonary vein Maximum A wave reversal by US.doppler

DescriptionA wave reversal.max

Short namePulm v A-wave reversal.max DOP

ComponentA wave reversal.max

PropertyVel

TimingPt

System (specimen)Pulmonary vein

ScaleQn

MethodUS.doppler

ClassCARD.US

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.03

Last changed2.54

Part names

A wave reversal.maxVelPtPulmonary veinQnUS.dopplerA-wave reversal.maxVelocity (distance/time)Point in time (spot)Ultrasound.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.