LOINCActiveObservation

LOINC Code 18064-6: Left ventricular outflow tract Maximum pressure gradient dur systole by US.doppler

18064-6 is a LOINC code used to identify Left ventricular outflow tract Maximum pressure gradient dur systole 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 Pressure gradient.systole.max. It is commonly used with the system or sample type Heart.ventricle.left.outflow tract.

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 Pressure gradient.systole.max. It is commonly used with the system or sample type Heart.ventricle.left.outflow tract.

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

  • Left ventricular outflow tract Maximum pressure gradient dur systole by US.doppler
  • Pressure gradient.systole.max
  • CARD.US; Cardiac; Cardio; Cardiology; DOP; DUPLEX; Echography; Grad; Gradient sys; Heart Disease; Hrt; Hrt ventr; L; Largest; LT; LV; LVOT; Max grad sys; Max press grad sys; Maximal; Maximum; Peak; Point in time; Press grad; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; Sys; Sys.max; Syst; ULS; Ultrasound; Ventricular

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

Left ventricular outflow tract Maximum pressure gradient dur systole by US.dopplerLVOT Max press grad sys DOPPressure gradient.systole.maxCARD.USPressDiffPtHeart.ventricle.left.outflow tract

Frequently asked questions

Code details

Code18064-6
SystemLOINC
Display nameLeft ventricular outflow tract Maximum pressure gradient dur systole by US.doppler
DescriptionPressure gradient.systole.max
Short nameLVOT Max press grad sys DOP
ComponentPressure gradient.systole.max
PropertyPressDiff
TimingPt
System (specimen)Heart.ventricle.left.outflow tract
ScaleQn
MethodUS.doppler
ClassCARD.US
Example unitsmm Hg
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.67

Part names

Pressure gradient.systole.maxPressDiffPtHeart.ventricle.left.outflow tractQnUS.dopplerMaximum pressure gradient dur systolePressure DifferencePoint in time (spot)Heart ventricle Left outflow tractUltrasound.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.

LOINC Code 18064-6 | HealthAssure