LOINCActive

LOINC Code 18833-4: First Body weight

18833-4 is a LOINC code used to identify First Body weight 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 Body weight. It is commonly used with the system or sample type ^Patient.

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 Body weight. It is commonly used with the system or sample type ^Patient.

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
  • Method: Measured

What it does not mean

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

Key facts

  • First Body weight
  • Body weight
  • 1st; ATTACH; ATTACH.CLINRPT; Bdy weight; bod; Bodies; Encounter; QNT; Quan; Quant; Quantitative; Wt

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

First Body weightBody weightATTACH.CLINRPTMassEnctr^frst^PatientQn

Frequently asked questions

Code details

Code18833-4
SystemLOINC
Display nameFirst Body weight
DescriptionBody weight
ComponentBody weight
PropertyMass
TimingEnctr^frst
System (specimen)^Patient
ScaleQn
MethodMeasured
ClassATTACH.CLINRPT
Example unitskg;lb
StatusACTIVE

Flags

BillableNo
Valid clinical useNo

Source

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

Part names

Body weightMassEnctr^frst^PatientQnMeasured

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 18833-4 | HealthAssure