LOINCActiveObservation

LOINC Code 20178-0: Aorta root Crossection [Area] by US 2D

20178-0 is a LOINC code used to identify Aorta root Crossection [Area] by US 2D 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.2D

What it does not mean

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

Key facts

  • Aorta root Crossection [Area] by US 2D
  • Crossection
  • Measured
  • 2D US; AO; AO root; Aortic; CARD.US; Cardio; Cardiology; Echography; Heart Disease; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Ultrasound - 2-dimensional; 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 2DAO root Xsection Area 2D USCrossectionCARD.USAreaPtAorta.root

Frequently asked questions

Code details

Code20178-0
SystemLOINC
Display nameAorta root Crossection [Area] by US 2D
DescriptionCrossection
Short nameAO root Xsection Area 2D US
ComponentCrossection
PropertyArea
TimingPt
System (specimen)Aorta.root
ScaleQn
MethodUS.2D
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.2DPoint in time (spot)Aorta rootUltrasound 2D

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.

LOINC Code 20178-0 | HealthAssure