LOINCActiveObservation

LOINC Code 93633-6: Heart Left ventricular outflow tract/Maximum blood flow aortic valve by US.doppler

93633-6 is a LOINC code used to identify Heart Left ventricular outflow tract/Maximum blood flow aortic valve 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.max.left ventricular outflow tract/blood flow.max.aortic valve. It is commonly used with the system or sample type Heart.

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.max.left ventricular outflow tract/blood flow.max.aortic valve. It is commonly used with the system or sample type Heart.

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

  • Heart Left ventricular outflow tract/Maximum blood flow aortic valve by US.doppler
  • Blood flow velocity.max.left ventricular outflow tract/blood flow.max.aortic valve
  • Bld flow; Bld flow vel; Bld flow.velocity; CARD.US; Cardiac; Cardiology; DOP; DUPLEX; Dynamic; Echography; Hrt; L; Largest; LT; LVOT; LVOT/AV Vmax; Maximal; Maximum; Peak; Peak velocity; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Vel; Velocity ratio; 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

Heart Left ventricular outflow tract/Maximum blood flow aortic valve by US.dopplerHrt LVOT/Aortic valve DOPBlood flow velocity.max.left ventricular outflow tract/blood flow.max.aortic valveCARD.USVelRtoPtHeart

Frequently asked questions

Code details

Code93633-6
SystemLOINC
Display nameHeart Left ventricular outflow tract/Maximum blood flow aortic valve by US.doppler
DescriptionBlood flow velocity.max.left ventricular outflow tract/blood flow.max.aortic valve
Short nameHrt LVOT/Aortic valve DOP
ComponentBlood flow velocity.max.left ventricular outflow tract/blood flow.max.aortic valve
PropertyVelRto
TimingPt
System (specimen)Heart
ScaleQn
MethodUS.doppler
ClassCARD.US
Example unitsratio
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

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

Part names

Blood flow velocity.max.left ventricular outflow tract/blood flow.max.aortic valveVelRtoPtHeartQnUS.dopplerLeft ventricular outflow tract/Aortic valve maximum blood flow velocityVelocity RatioPoint 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.