LOINCActiveObservation

LOINC Code 20168-1: Circulatory system Acceleration by US.doppler

20168-1 is a LOINC code used to identify Circulatory system Acceleration 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 Acceleration. It is commonly used with the system or sample type {Circulatory system}.

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 Acceleration. It is commonly used with the system or sample type {Circulatory system}.

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

  • Circulatory system Acceleration by US.doppler
  • Acceleration
  • The time interval from the onset of systolic flow to the initial peak systolic velocity.
  • Acc; Accel; ACCT1; AT; CARD.US; Cardio; Cardiology; Circ; Circ sys; DOP; DUPLEX; Echography; Heart Disease; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound

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

Circulatory system Acceleration by US.dopplerCirc sys Accel Time DOPAccelerationCARD.USTimePt{Circulatory system}

Frequently asked questions

Code details

Code20168-1
SystemLOINC
Display nameCirculatory system Acceleration by US.doppler
DescriptionAcceleration
Short nameCirc sys Accel Time DOP
ComponentAcceleration
PropertyTime
TimingPt
System (specimen){Circulatory system}
ScaleQn
MethodUS.doppler
ClassCARD.US
Example unitsms
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0m
Last changed2.48

Part names

AccelerationTimePt{Circulatory system}QnUS.dopplerTime (e.g. seconds)Point 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.

LOINC Code 20168-1 | HealthAssure