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 78184-9: Pulmonary vein A-wave duration by Ultrasound.doppler.PW

Name: LOINC Code 78184-9: Pulmonary vein A-wave duration by Ultrasound.doppler.PW
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:58.755Z

78184-9 is a LOINC code used to identify Pulmonary vein A-wave duration by Ultrasound.doppler.PW 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 duration. 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 duration. 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.PW

What it does not mean

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

Key facts

Pulmonary vein A-wave duration by Ultrasound.doppler.PW
A wave duration
Atrial wave; A-wave; A-wave duration; CARD.US; Cardio; Cardiology; DOP; DOP.PW; DUPLEX; Durat; Echography; Heart Disease; Point in time; Pulm v; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Ven; Venous

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 A-wave duration by Ultrasound.doppler.PWPulm vein A wave duration DOP.PWA wave durationCARD.USTimePtPulmonary vein

Frequently asked questions

Code details

Code78184-9

SystemLOINC

Display namePulmonary vein A-wave duration by Ultrasound.doppler.PW

DescriptionA wave duration

Short namePulm vein A wave duration DOP.PW

ComponentA wave duration

PropertyTime

TimingPt

System (specimen)Pulmonary vein

ScaleQn

MethodUS.doppler.PW

ClassCARD.US

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.54

Last changed2.54

Part names

A wave durationTimePtPulmonary veinQnUS.doppler.PWA-wave durationTime (e.g. seconds)Point in time (spot)Ultrasound.doppler.PW

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.