LOINCActiveObservation

LOINC Code 101684-9: Percentage of body water

101684-9 is a LOINC code used to identify Percentage of body water 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 water. 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 water. 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
  • Order vs observation: Observation
  • Method: Measured

What it does not mean

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

Key facts

  • Percentage of body water
  • Body water
  • Bdy water; bod; Bodies; BODY WEIGHT.MOLEC; Mass Fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random

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

Percentage of body waterBody H2O %Body waterBDYWGT.MOLECMFrPt^Patient

Frequently asked questions

Code details

Code101684-9
SystemLOINC
Display namePercentage of body water
DescriptionBody water
Short nameBody H2O %
ComponentBody water
PropertyMFr
TimingPt
System (specimen)^Patient
ScaleQn
MethodMeasured
ClassBDYWGT.MOLEC
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.75
Last changed2.76

Part names

Body waterMFrPt^PatientQnMeasuredMass fractionPoint in time (spot)

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.