LOINCActiveObservation

LOINC Code 93643-5: Right ventricular Major axis diastole [Length] by US.2D.A4C

93643-5 is a LOINC code used to identify Right ventricular Major axis diastole [Length] by US.2D.A4C 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 Major axis.diastole. It is commonly used with the system or sample type Heart.ventricle.right.

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 Major axis.diastole. It is commonly used with the system or sample type Heart.ventricle.right.

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.A4C

What it does not mean

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

Key facts

  • Right ventricular Major axis diastole [Length] by US.2D.A4C
  • Major axis.diastole
  • 2D US; CARD.US; Cardiac; Cardiology; Dias; Diast; Diastoli; Echography; Hrt; Hrt ventr; LAX; Length; Long axis; Major axis dias; Point in time; QNT; Quan; Quant; Quantitative; R; Random; RT; RV; Sonogram; Sonograph; Sonography; ULS; Ultrasound; Ultrasound - 2-dimensional; 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

Right ventricular Major axis diastole [Length] by US.2D.A4CRV Major axis dias A4CMajor axis.diastoleCARD.USLenPtHeart.ventricle.right

Frequently asked questions

Code details

Code93643-5
SystemLOINC
Display nameRight ventricular Major axis diastole [Length] by US.2D.A4C
DescriptionMajor axis.diastole
Short nameRV Major axis dias A4C
ComponentMajor axis.diastole
PropertyLen
TimingPt
System (specimen)Heart.ventricle.right
ScaleQn
MethodUS.2D.A4C
ClassCARD.US
Example unitsmm
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.67
Last changed2.67

Part names

Major axis.diastoleLenPtHeart.ventricle.rightQnUS.2D.A4CMajor axis diastoleLengthPoint in time (spot)Heart.ventricle Right

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.