LOINCActiveObservation

LOINC Code 29422-3: Pulmonary vein - right lower Maximum blood flow velocity during systole/Maximum blood flow velocity during diastole by US.doppler

29422-3 is a LOINC code used to identify Pulmonary vein - right lower Maximum blood flow velocity during systole/Maximum blood flow velocity during diastole 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 Blood flow velocity.systole.max/Blood flow velocity.diastole.max. It is commonly used with the system or sample type Pulmonary vein.right lower.

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 Blood flow velocity.systole.max/Blood flow velocity.diastole.max. It is commonly used with the system or sample type Pulmonary vein.right lower.

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 - right lower Maximum blood flow velocity during systole/Maximum blood flow velocity during diastole by US.doppler
  • Blood flow velocity.systole.max/Blood flow velocity.diastole.max
  • Bld flow; Bld flow vel; Bld flow.velocity; CARD.US; Cardio; Cardiology; Dias; Dias.max; Diast; Diastoli; DOP; DUPLEX; Dynamic; Echography; Heart Disease; Largest; Low; Maximal; Maximum; Peak; Point in time; Pulm v; PV-RL; QNT; Quan; Quant; Quantitative; R; Random; RLPV; RT; Sonogram; Sonograph; Sonography; Sys; Sys.max; Syst; ULS; Ultrasound; V sys; Vel; Velocity ratio; Ven; Venous; Vmax dias; 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

Pulmonary vein - right lower Maximum blood flow velocity during systole/Maximum blood flow velocity during diastole by US.dopplerPV-RL Vmax sys/dias DOPBlood flow velocity.systole.max/Blood flow velocity.diastole.maxCARD.USVelRtoPtPulmonary vein.right lower

Frequently asked questions

Code details

Code29422-3
SystemLOINC
Display namePulmonary vein - right lower Maximum blood flow velocity during systole/Maximum blood flow velocity during diastole by US.doppler
DescriptionBlood flow velocity.systole.max/Blood flow velocity.diastole.max
Short namePV-RL Vmax sys/dias DOP
ComponentBlood flow velocity.systole.max/Blood flow velocity.diastole.max
PropertyVelRto
TimingPt
System (specimen)Pulmonary vein.right lower
ScaleQn
MethodUS.doppler
ClassCARD.US
Example unitsratio;index
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.03
Last changed2.69

Part names

Blood flow velocity.systole.max/Blood flow velocity.diastole.maxVelRtoPtPulmonary vein.right lowerQnUS.dopplerVelocity RatioPoint in time (spot)Pulmonary vein Right lowerUltrasound.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.