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 20179-8: R-R interval by US --at aortic flow measurement

Name: LOINC Code 20179-8: R-R interval by US --at aortic flow measurement
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.845Z

20179-8 is a LOINC code used to identify R-R interval by US --at aortic flow measurement 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 RR interval^at aortic flow measurement. 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 RR interval^at aortic flow measurement. 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

What it does not mean

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

Key facts

R-R interval by US --at aortic flow measurement
RR interval^at aortic flow measurement
@ AV flow; AV; CARD.US; Cardiac; Cardio; Cardiology; Dynamic; Echography; Heart Disease; Hrt; Point in time; QNT; Quan; Quant; Quantitative; Random; R-R interval; 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

R-R interval by US --at aortic flow measurementR-R interval @ AV flow USRR interval^at aortic flow measurementCARD.USTimePtHeart

Frequently asked questions

Code details

Code20179-8

SystemLOINC

Display nameR-R interval by US --at aortic flow measurement

DescriptionRR interval^at aortic flow measurement

Short nameR-R interval @ AV flow US

ComponentRR interval^at aortic flow measurement

PropertyTime

TimingPt

System (specimen)Heart

ScaleQn

MethodUS

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

RR interval^at aortic flow measurementTimePtHeartQnUSTime (e.g. seconds)Point in time (spot)Ultrasound

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.