LOINCActiveObservation

LOINC Code 79921-3: Tricuspid valve Maximum regurgitant blood flow velocity during systole by US.doppler continuous wave

79921-3 is a LOINC code used to identify Tricuspid valve Maximum regurgitant blood flow velocity during systole by US.doppler continuous wave 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 Regurgitant blood flow velocity.systole.max. It is commonly used with the system or sample type Tricuspid valve.

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 Regurgitant blood flow velocity.systole.max. It is commonly used with the system or sample type Tricuspid valve.

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.CW

What it does not mean

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

Key facts

  • Tricuspid valve Maximum regurgitant blood flow velocity during systole by US.doppler continuous wave
  • Regurgitant blood flow velocity.systole.max
  • Bld flow; Bld flow vel; Bld flow.velocity; CARD.US; CARD.US.DICOM; Cardio; Cardiology; Continuous wave; DOP; DOP.CW; DUPLEX; Dynamic; Echography; Heart Disease; Largest; Max regurg vel sys; Max V; Maximal; Maximum; Peak; Point in time; QNT; Quan; Quant; Quantitative; Random; Regurg bld flow vel; Sonogram; Sonograph; Sonography; Sys; Sys.max; Syst; TV; ULS; Ultrasound; V max; V sys; Vel; VEL max; Velocity; Vmax; Vmax sys

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

Tricuspid valve Maximum regurgitant blood flow velocity during systole by US.doppler continuous waveTV Max regurg vel sysRegurgitant blood flow velocity.systole.maxCARD.US.DICOMVelPtTricuspid valve

Frequently asked questions

Code details

Code79921-3
SystemLOINC
Display nameTricuspid valve Maximum regurgitant blood flow velocity during systole by US.doppler continuous wave
DescriptionRegurgitant blood flow velocity.systole.max
Short nameTV Max regurg vel sys
ComponentRegurgitant blood flow velocity.systole.max
PropertyVel
TimingPt
System (specimen)Tricuspid valve
ScaleQn
MethodUS.doppler.CW
ClassCARD.US.DICOM
Example unitscm/s
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.67

Part names

Regurgitant blood flow velocity.systole.maxVelPtTricuspid valveQnUS.doppler.CWMaximum regurgitant blood flow velocity during systoleVelocity (distance/time)Point in time (spot)Ultrasound.doppler.CW

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.