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LOINC Code 77906-6: Left atrial End-systolic volume/Body surface area [Volume/Area] by US.2D+Calculated by modified Simpson method

77906-6 is a LOINC code used to identify Left atrial End-systolic volume/Body surface area [Volume/Area] by US.2D+Calculated by modified Simpson method 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 End-systolic volume/Body surface area. It is commonly used with the system or sample type Heart.atrium.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 End-systolic volume/Body surface area. It is commonly used with the system or sample type Heart.atrium.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.2D+Calculated by modified Simpson method

What it does not mean

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

Key facts

Left atrial End-systolic volume/Body surface area [Volume/Area] by US.2D+Calculated by modified Simpson method
End-systolic volume/Body surface area
The modified Simpson method is commonly used for volume measurements in 2D cardiac imaging. It uses the biplane method of disks to measure volume, meaning that the total volume is calculated by adding together the two-dimensional area measurements of the series of circular or elliptical slices that, taken as a whole, represent the chamber being imaged. [PMID16376782] The volume measurements can then be used in calculations of other parameters related to cardiac function.
2D US; Atrial; Bdy surface; bod; Bodies; BSA; Calc; Calculation; CARD.US; Cardiac; Cardio; Cardiology; Echography; ES vol; Heart Disease; Hrt; L; LA; LAA; LAVI; Left Atrial Volume Index; LT; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; Surf; ULS; Ultrasound; Ultrasound - 2-dimensional; US.2D+mod Simpson; Vol; Volume/area

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 atrial End-systolic volume/Body surface area [Volume/Area] by US.2D+Calculated by modified Simpson methodLA ES vol/BSA US.2D+mod SimpsonEnd-systolic volume/Body surface areaCARD.USArVolPtHeart.atrium.left

Frequently asked questions

Code details

Code77906-6
SystemLOINC
Display nameLeft atrial End-systolic volume/Body surface area [Volume/Area] by US.2D+Calculated by modified Simpson method
DescriptionEnd-systolic volume/Body surface area
Short nameLA ES vol/BSA US.2D+mod Simpson
ComponentEnd-systolic volume/Body surface area
PropertyArVol
TimingPt
System (specimen)Heart.atrium.left
ScaleQn
MethodUS.2D+Calculated by modified Simpson method
ClassCARD.US
Example unitsmL/m2
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.52
Last changed2.52

Part names

End-systolic volume/Body surface areaArVolPtHeart.atrium.leftQnUS.2D+Calculated by modified Simpson methodVolume/AreaPoint in time (spot)Heart.atrium Left

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.