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 20177-2: Aorta root Crossection [Area] by US.calculated

Name: LOINC Code 20177-2: Aorta root Crossection [Area] by US.calculated
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:28.845Z

20177-2 is a LOINC code used to identify Aorta root Crossection [Area] by US.calculated 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 Crossection. It is commonly used with the system or sample type Aorta.root.

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 Crossection. It is commonly used with the system or sample type Aorta.root.

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.calculated

What it does not mean

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

Key facts

Aorta root Crossection [Area] by US.calculated
Crossection
Measured calc from DIAM pi (D/2) sq
AO; AO root; Aortic; Calc; Calculation; CARD.US; Cardio; Cardiology; Echography; Heart Disease; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; US Calc; US+Calc; Xsection

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

Aorta root Crossection [Area] by US.calculatedAO root Xsection Area US CalcCrossectionCARD.USAreaPtAorta.root

Frequently asked questions

Code details

Code20177-2

SystemLOINC

Display nameAorta root Crossection [Area] by US.calculated

DescriptionCrossection

Short nameAO root Xsection Area US Calc

ComponentCrossection

PropertyArea

TimingPt

System (specimen)Aorta.root

ScaleQn

MethodUS.calculated

ClassCARD.US

Example unitscm2

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.48

Part names

CrossectionAreaPtAorta.rootQnUS.calculatedPoint in time (spot)Aorta rootUltrasound.calculated

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.