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 12009-7: Fetal Heart R-R duration US

Name: LOINC Code 12009-7: Fetal Heart R-R duration US
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:22.974Z

12009-7 is a LOINC code used to identify Fetal Heart R-R duration 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 RR duration. It is commonly used with the system or sample type Heart^Fetus.

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 duration. It is commonly used with the system or sample type Heart^Fetus.

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.measured

What it does not mean

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

Key facts

Fetal Heart R-R duration US
RR duration
Cardiac; Cardio; Cardiology; Durat; Echography; Fetal; Gyn; Gynecology; Heart Disease; Hrt; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Peak-to-peak time interval over 2 beats; Point in time; QNT; Quan; Quant; Quantitative; Random; R-R dur; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US+Meas

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

Fetal Heart R-R duration USFet Hrt R-R dur US.measRR durationOB.USTimePtHeart^fetus

Frequently asked questions

Code details

Code12009-7

SystemLOINC

Display nameFetal Heart R-R duration US

DescriptionRR duration

Short nameFet Hrt R-R dur US.meas

ComponentRR duration

PropertyTime

TimingPt

System (specimen)Heart^Fetus

ScaleQn

MethodUS.measured

ClassOB.US

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.48

Part names

RR durationTimePtHeart^fetusQnUS.measuredR-R durationTime (e.g. seconds)Point in time (spot)Ultrasound.measured

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.