LOINCActiveObservation

LOINC Code 105001-2: Left main coronary artery Diameter by US

105001-2 is a LOINC code used to identify Left main coronary artery Diameter 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 Diameter. It is commonly used with the system or sample type Left main coronary artery.

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 Diameter. It is commonly used with the system or sample type Left main coronary artery.

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 main coronary artery Diameter by US
  • Diameter
  • Art; CARD.US; Cardiology; Coronary segment 5; DIA; Diam; Echography; L; Length; LM; LT; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound

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 main coronary artery Diameter by USLM Diam USDiameterCARD.USLenPtLeft main coronary artery

Frequently asked questions

Code details

Code105001-2
SystemLOINC
Display nameLeft main coronary artery Diameter by US
DescriptionDiameter
Short nameLM Diam US
ComponentDiameter
PropertyLen
TimingPt
System (specimen)Left main coronary artery
ScaleQn
MethodUS
ClassCARD.US
Example unitsmm
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.78
Last changed2.78

Part names

DiameterLenPtLeft main coronary arteryQnUSLengthPoint in time (spot)Ultrasound

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 105001-2 | HealthAssure