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 11989-1: Fetal Thorax Circumference measured by ellipse overlay (US)

Name: LOINC Code 11989-1: Fetal Thorax Circumference measured by ellipse overlay (US)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:22.974Z

11989-1 is a LOINC code used to identify Fetal Thorax Circumference measured by ellipse overlay (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 Perimeter. It is commonly used with the system or sample type Thorax^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 Perimeter. It is commonly used with the system or sample type Thorax^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.ellipse overlay

What it does not mean

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

Key facts

Fetal Thorax Circumference measured by ellipse overlay (US)
Perimeter
Measured with an ellipse overlay
by ellipse overlay; Circum; Circumference; Echography; Fetal; Gyn; Gynecology; Length; OB; ObGyn; OBSTERICAL; OBSTERICAL.ULTRASOUND; Obstetrical; Obstetrics; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; TC; Thoracic; 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 Thorax Circumference measured by ellipse overlay (US)Fet Thorax Circum by ellipse overlayPerimeterOB.USLenPtThorax^fetus

Frequently asked questions

Code details

Code11989-1

SystemLOINC

Display nameFetal Thorax Circumference measured by ellipse overlay (US)

DescriptionPerimeter

Short nameFet Thorax Circum by ellipse overlay

ComponentPerimeter

PropertyLen

TimingPt

System (specimen)Thorax^Fetus

ScaleQn

MethodUS.measured.ellipse overlay

ClassOB.US

Example unitscm

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.48

Part names

PerimeterLenPtThorax^fetusQnUS.measured.ellipse overlayLengthPoint in time (spot)Ultrasound.measured.ellipse overlay

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.