LOINCActiveObservation

LOINC Code 18155-2: Left ventricular Thickness septal wall/Thickness posterior wall by US

18155-2 is a LOINC code used to identify Left ventricular Thickness septal wall/Thickness posterior wall by 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 Thickness.septal wall/Thickness.posterior wall. It is commonly used with the system or sample type Heart.ventricle.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 Thickness.septal wall/Thickness.posterior wall. It is commonly used with the system or sample type Heart.ventricle.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

What it does not mean

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

Key facts

  • Left ventricular Thickness septal wall/Thickness posterior wall by US
  • Thickness.septal wall/Thickness.posterior wall
  • CARD.US; Cardiac; Cardio; Cardiology; Echography; Heart Disease; Hrt; Hrt ventr; L; Length Ratio; LT; LV; Point in time; PWT; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; SWT; Thick; ULS; Ultrasound; Ventricular

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

Left ventricular Thickness septal wall/Thickness posterior wall by USLV SWT/PWT USThickness.septal wall/Thickness.posterior wallCARD.USLenRtoPtHeart.ventricle.left

Frequently asked questions

Code details

Code18155-2
SystemLOINC
Display nameLeft ventricular Thickness septal wall/Thickness posterior wall by US
DescriptionThickness.septal wall/Thickness.posterior wall
Short nameLV SWT/PWT US
ComponentThickness.septal wall/Thickness.posterior wall
PropertyLenRto
TimingPt
System (specimen)Heart.ventricle.left
ScaleQn
MethodUS
ClassCARD.US
Example unitsratio
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.48

Part names

Thickness.septal wall/Thickness.posterior wallLenRtoPtHeart.ventricle.leftQnUSLength RatioPoint in time (spot)Heart ventricle - leftUltrasound

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 18155-2 | HealthAssure