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 20171-5: Acceleration/Acceleration 2 by US

Name: LOINC Code 20171-5: Acceleration/Acceleration 2 by US
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.845Z

20171-5 is a LOINC code used to identify Acceleration/Acceleration 2 by US 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/Acceleration 2. It is commonly used with the system or sample type Circulatory system.XXX.

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/Acceleration 2. It is commonly used with the system or sample type Circulatory system.XXX.

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

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Acceleration/Acceleration 2 by US
Acceleration/Acceleration 2
Acc; Accel; Accel 2; ACCT1; ACCT2; CARD.US; Cardio; Cardiology; Circ; Circ sys; Echography; Heart Disease; II; Misc; Miscellaneous; Other; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; Spec; Time ratio; To be specified in another part of the message; ULS; Ultrasound; Unspecified

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

Acceleration/Acceleration 2 by USAccel/Accel 2 USAcceleration/Acceleration 2CARD.USTRtoPtCirculatory system.XXX

Frequently asked questions

Code details

Code20171-5

SystemLOINC

Display nameAcceleration/Acceleration 2 by US

DescriptionAcceleration/Acceleration 2

Short nameAccel/Accel 2 US

ComponentAcceleration/Acceleration 2

PropertyTRto

TimingPt

System (specimen)Circulatory system.XXX

ScaleQn

MethodUS

ClassCARD.US

Example unitsratio

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.48

Part names

Acceleration/Acceleration 2TRtoPtCirculatory system.XXXQnUSTime RatioPoint in time (spot)Circulatory system XXXUltrasound

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.