HL7 v2.3 Vocabulary
0.2.0 - ci-build

HL7 v2.3 Vocabulary, published by HL7/FO. This guide is not an authorized publication; it is the continuous build for version 0.2.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/frankoemig/hl7.v2.terminology.v23/ and changes regularly. See the Directory of published versions

CodeSystem: Kind of Quantity (2.3 - 1.0.0) (Experimental)

Official URL: http://terminology.hl7.org/v2plusvocab/CodeSystem/kindOfQuantity Version: 1.0.0
Active as of 2026-03-13 Computable Name: KindOfQuantity
Other Identifiers: OID:2.16.840.1.113883.18.149, urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0254

Copyright/Legal: HL7 Inc., 2026

HL7 published code system of concepts that describe categories of an underlying kind of property represented by an observation. These are intended to distinguish concentrations from total amounts, molar concentrations from mass concentrations, partial pressures from colors, and so forth. These are discussed more fully in the LOINC Users’ Manual. These defined categories are derived from the approach described in 1995 edition of the IUPAC Silver Book. These distinctions are used in IUPAC and LOINC standard codes. Needs review by OO and HTA to determined if this is a value set built on LOINC part codes or some other external vocabulary.

This Code system is referenced in the content logical definition of the following value sets:

Properties

This code system defines the following properties for its concepts

NameCodeURITypeDescription
version introduced versionIntroduced http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced string version when was this code introduced
version deprecated versionDeprecated http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated string version when was this code deprecated
status status http://hl7.org/fhir/concept-properties#status code A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired
comment, to suppress IG-publisher warning, to be replaced with standard later comment http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment string A string that provides additional detail pertinent to the use or understanding of the concept
usage usage http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage string usage notes for this code
modified modified http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified dateTime date of last modification

Concepts

This case-sensitive code system http://terminology.hl7.org/v2plusvocab/CodeSystem/kindOfQuantity defines the following codes:

CodeDisplayDefinitionversion introduced
ABS Absorbance Absorbance 2.3
ACNC Concentration, Arbitrary Substance Concentration, Arbitrary Substance 2.3
ACT Activity Activity 2.3
APER Appearance Appearance 2.3
ARB Arbitrary Arbitrary 2.3
AREA Area Area 2.3
ASPECT Aspect Aspect 2.3
CACT Catalytic Activity Catalytic Activity 2.3
CCNT Catalytic Content Catalytic Content 2.3
CCRTO Catalytic Concentration Ratio Catalytic Concentration Ratio 2.3
CFR Catalytic Fraction Catalytic Fraction 2.3
CLAS Class Class 2.3
CNC Catalytic Concentration Catalytic Concentration 2.3
CNST Constant Constant 2.3
COEF Coefficient Coefficient 2.3
COLOR Color Color 2.3
CONS Consistency Consistency 2.3
CRAT Catalytic Rate Catalytic Rate 2.3
CRTO Catalytic Ratio Catalytic Ratio 2.3
DEN Density Density 2.3
DEV Device Device 2.3
DIFF Difference Difference 2.3
ELAS Elasticity Elasticity 2.3
ELPOT Electrical Potential (Voltage) Electrical Potential (Voltage) 2.3
ELRAT Electrical current (amperage) Electrical current (amperage) 2.3
ELRES Electrical Resistance Electrical Resistance 2.3
ENGR Energy Energy 2.3
ENT Entitic Entitic 2.3
ENTCAT Entitic Catalytic Activity Entitic Catalytic Activity 2.3
ENTNUM Entitic Number Entitic Number 2.3
ENTSUB Entitic Substance of Amount Entitic Substance of Amount 2.3
ENTVOL Entitic Volume Entitic Volume 2.3
EQL Equilibrium Equilibrium 2.3
FORCE Mechanical force Mechanical force 2.3
FREQ Frequency Frequency 2.3
IMP Impression/ interpretation of study Impression/ interpretation of study 2.3
KINV Kinematic Viscosity Kinematic Viscosity 2.3
LEN Length Length 2.3
LINC Length Increment Length Increment 2.3
LIQ Liquefaction Liquefaction 2.3
MASS Mass Mass 2.3
MCNC Mass Concentration Mass Concentration 2.3
MCNT Mass Content Mass Content 2.3
MCRTO Mass Concentration Ratio Mass Concentration Ratio 2.3
MFR Mass Fraction Mass Fraction 2.3
MGFLUX Magnetic flux Magnetic flux 2.3
MINC Mass Increment Mass Increment 2.3
MORPH Morphology Morphology 2.3
MOTIL Motility Motility 2.3
MRAT Mass Rate Mass Rate 2.3
MRTO Mass Ratio Mass Ratio 2.3
NCNC Number Concentration Number Concentration 2.3
NCNT Number Content Number Content 2.3
NFR Number Fraction Number Fraction 2.3
NRTO Number Ratio Number Ratio 2.3
NUM Number Number 2.3
OD Optical density Optical density 2.3
OSMOL Osmolality Osmolality 2.3
PRES Pressure (Partial) Pressure (Partial) 2.3
PRID Presence/Identity/Existence Presence/Identity/Existence 2.3
PWR Power (wattage) Power (wattage) 2.3
RANGE Ranges Ranges 2.3
RATIO Ratios Ratios 2.3
RCRLTM Reciprocal Relative Time Reciprocal Relative Time 2.3
RDEN Relative Density Relative Density 2.3
REL Relative Relative 2.3
RLMCNC Relative Mass Concentration Relative Mass Concentration 2.3
RLSCNC Relative Substance Concentration Relative Substance Concentration 2.3
RLTM Relative Time Relative Time 2.3
SATFR Saturation Fraction Saturation Fraction 2.3
SCNC Substance Concentration Substance Concentration 2.3
SCNCIN Substance Concentration Increment Substance Concentration Increment 2.3
SCNT Substance Content Substance Content 2.3
SCNTR Substance Content Rate Substance Content Rate 2.3
SCRTO Substance Concentration Ratio Substance Concentration Ratio 2.3
SFR Substance Fraction Substance Fraction 2.3
SHAPE Shape Shape 2.3
SMELL Smell Smell 2.3
SRAT Substance Rate Substance Rate 2.3
SRTO Substance Ratio Substance Ratio 2.3
SUB Substance Amount Substance Amount 2.3
SUSC Susceptibility Susceptibility 2.3
TASTE Taste Taste 2.3
TEMP Temperature Temperature 2.3
TEMPDF Temperature Difference Temperature Difference 2.3
TEMPIN Temperature Increment Temperature Increment 2.3
THRMCNC Threshold Mass Concentration Threshold Mass Concentration 2.3
THRSCNC Threshold Substance Concentration Threshold Substance Concentration 2.3
TIME Time (e.g. seconds) Time (e.g. seconds) 2.3
TITR Dilution Factor (Titer) Dilution Factor (Titer) 2.3
TMDF Time Difference Time Difference 2.3
TMSTP Time Stamp-Date and Time Time Stamp-Date and Time 2.3
TRTO Time Ratio Time Ratio 2.3
TYPE Type Type 2.3
VCNT Volume Content Volume Content 2.3
VEL Velocity Velocity 2.3
VELRT Velocity Ratio Velocity Ratio 2.3
VFR Volume Fraction Volume Fraction 2.3
VISC Viscosity Viscosity 2.3
VOL Volume Volume 2.3
VRAT Volume Rate Volume Rate 2.3
VRTO Volume Ratio Volume Ratio 2.3