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Kind of Quantity
Vocabulary Type Code System - Universal
Concept Domain Kind of Quantity
Code System Name
Code System Identifier
Code System OID
HL7 Table Identifier HL70254
Version
Status Active
Where Used OM1-42
Purpose and Use HL7-defined table of codes that describe the underlying kind of property represented by an observation. The categories 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. They are derived from the approach described in 1995 edition of the IUPAC Silver Book. These distinctions are used in IUPAC and LOINC standard codes. The distinctions of true quantities in this table are based primarily on dimensional analyses. The table contains a number of "families," those related to simple counts (number, number concentration, etc.), to mass (mass, mass concentration, etc.), to enzyme activity (catalytic content, catalytic concentration, etc.), and molar or equivalents (substance content, substance concentration).


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