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 12021-2: Uterine artery - left Resistivity index US.doppler

Name: LOINC Code 12021-2: Uterine artery - left Resistivity index US.doppler
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:22.974Z

12021-2 is a LOINC code used to identify Uterine artery - left Resistivity index 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 Resistivity index. It is commonly used with the system or sample type Uterine artery.left.

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 Resistivity index. It is commonly used with the system or sample type Uterine artery.left.

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

Uterine artery - left Resistivity index US.doppler
Resistivity index
Art; Cardio; Cardiology; DOP; DUPLEX; Echography; Gyn; Gynecology; Heart Disease; L; LT; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; QNT; Quan; Quant; Quantitative; Random; RI; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Uterine a-L; Velocity ratio

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

Uterine artery - left Resistivity index US.dopplerUterine a-L RI DOPResistivity indexOB.USVelRtoPtUterine artery.left

Frequently asked questions

Code details

Code12021-2

SystemLOINC

Display nameUterine artery - left Resistivity index US.doppler

DescriptionResistivity index

Short nameUterine a-L RI DOP

ComponentResistivity index

PropertyVelRto

TimingPt

System (specimen)Uterine artery.left

ScaleQn

MethodUS.doppler

ClassOB.US

Example unitsindex

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.48

Part names

Resistivity indexVelRtoPtUterine artery.leftQnUS.dopplerVelocity RatioPoint in time (spot)Uterine artery LeftUltrasound.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.