LOINCActiveObservation

LOINC Code 18006-7: Inferior vena cava Diameter by US

18006-7 is a LOINC code used to identify Inferior vena cava 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 Vena cava.inferior.

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 Vena cava.inferior.

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

  • Inferior vena cava Diameter by US
  • Diameter
  • CARD.US; Cardio; Cardiology; DIA; Diam; Echography; Heart; Heart Disease; Inf; IVC; Length; Point in time; QNT; Quan; Quant; Quantitative; Random; Sonogram; Sonograph; Sonography; ULS; Ultrasound; VC

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

Inferior vena cava Diameter by USIVC Diam USDiameterCARD.USLenPtVena cava.inferior

Frequently asked questions

Code details

Code18006-7
SystemLOINC
Display nameInferior vena cava Diameter by US
DescriptionDiameter
Short nameIVC Diam US
ComponentDiameter
PropertyLen
TimingPt
System (specimen)Vena cava.inferior
ScaleQn
MethodUS
ClassCARD.US
Example unitscm
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0l
Last changed2.73

Part names

DiameterLenPtVena cava.inferiorQnUSLengthPoint in time (spot)Inferior vena cavaUltrasound

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 18006-7 | HealthAssure