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 18168-5: Aorta root Blood velocity-time integral by US.doppler

Name: LOINC Code 18168-5: Aorta root Blood velocity-time integral by US.doppler
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:27.586Z

18168-5 is a LOINC code used to identify Aorta root Blood velocity-time integral 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 velocity-time integral. It is commonly used with the system or sample type Aorta.root.

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 velocity-time integral. It is commonly used with the system or sample type Aorta.root.

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

Aorta root Blood velocity-time integral by US.doppler
Blood velocity-time integral
AO; AO root; Aortic; Bld vel; CARD.US; Cardio; Cardiology; DOP; DUPLEX; Echography; Heart Disease; Length; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; TVI; ULS; Ultrasound; Vel; VTI

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

Aorta root Blood velocity-time integral by US.dopplerAO root VTI DOPBlood velocity-time integralCARD.USLenPtAorta.root

Frequently asked questions

Code details

Code18168-5

SystemLOINC

Display nameAorta root Blood velocity-time integral by US.doppler

DescriptionBlood velocity-time integral

Short nameAO root VTI DOP

ComponentBlood velocity-time integral

PropertyLen

TimingPt

System (specimen)Aorta.root

ScaleQn

MethodUS.doppler

ClassCARD.US

Example unitscm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.70

Part names

Blood velocity-time integralLenPtAorta.rootQnUS.dopplerLengthPoint in time (spot)Aorta rootUltrasound.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.