This code system http://terminology.hl7.org/CodeSystem/v2-0254 defines the following codes:
| Code | Display | Definition | HL7 Concept Usage Notes |
| CACT | Catalytic Activity | Catalytic Activity | Adopted from the IUPAC Silver Book 1995” to the code |
| CNC | Catalytic Concentration | Catalytic Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| CCRTO | Catalytic Concentration Ratio | Catalytic Concentration Ratio | |
| CCNT | Catalytic Content | Catalytic Content | Adopted from the IUPAC Silver Book 1995” to the code |
| CFR | Catalytic Fraction | Catalytic Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| CRAT | Catalytic Rate | Catalytic Rate | Adopted from the IUPAC Silver Book 1995” to the code |
| CRTO | Catalytic Ratio | Catalytic Ratio | |
| ENT | Entitic | Entitic | Adopted from the IUPAC Silver Book 1995” to the code |
| ENTSUB | Entitic Substance of Amount | Entitic Substance of Amount | Adopted from the IUPAC Silver Book 1995” to the code |
| ENTCAT | Entitic Catalytic Activity | Entitic Catalytic Activity | Adopted from the IUPAC Silver Book 1995” to the code |
| ENTNUM | Entitic Number | Entitic Number | Adopted from the IUPAC Silver Book 1995” to the code |
| ENTVOL | Entitic Volume | Entitic Volume | Adopted from the IUPAC Silver Book 1995” to the code |
| MASS | Mass | Mass | Adopted from the IUPAC Silver Book 1995” to the code |
| MCNC | Mass Concentration | Mass Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| MCRTO | Mass Concentration Ratio | Mass Concentration Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| MCNT | Mass Content | Mass Content | |
| MFR | Mass Fraction | Mass Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| MINC | Mass Increment | Mass Increment | Adopted from the IUPAC Silver Book 1995” to the code |
| MRAT | Mass Rate | Mass Rate | Adopted from the IUPAC Silver Book 1995” to the code |
| MRTO | Mass Ratio | Mass Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| NUM | Number | Number | Adopted from the IUPAC Silver Book 1995” to the code |
| NCNC | Number Concentration | Number Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| NCNT | Number Content | Number Content | Adopted from the IUPAC Silver Book 1995” to the code |
| NFR | Number Fraction | Number Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| NRTO | Number Ratio | Number Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| SUB | Substance Amount | Substance Amount | Adopted from the IUPAC Silver Book 1995” to the code |
| SCNC | Substance Concentration | Substance Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| SCRTO | Substance Concentration Ratio | Substance Concentration Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| SCNT | Substance Content | Substance Content | Adopted from the IUPAC Silver Book 1995” to the code |
| SCNTR | Substance Content Rate | Substance Content Rate | Adopted from the IUPAC Silver Book 1995” to the code |
| SFR | Substance Fraction | Substance Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| SCNCIN | Substance Concentration Increment | Substance Concentration Increment | Adopted from the IUPAC Silver Book 1995” to the code |
| SRAT | Substance Rate | Substance Rate | Adopted from the IUPAC Silver Book 1995” to the code |
| SRTO | Substance Ratio | Substance Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| VOL | Volume | Volume | Adopted from the IUPAC Silver Book 1995” to the code |
| VCNT | Volume Content | Volume Content | Adopted from the IUPAC Silver Book 1995” to the code |
| VFR | Volume Fraction | Volume Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| VRAT | Volume Rate | Volume Rate | Adopted from the IUPAC Silver Book 1995” to the code |
| VRTO | Volume Ratio | Volume Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| ACNC | Concentration, Arbitrary Substance | Concentration, Arbitrary Substance | |
| RLMCNC | Relative Mass Concentration | Relative Mass Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| RLSCNC | Relative Substance Concentration | Relative Substance Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| THRMCNC | Threshold Mass Concentration | Threshold Mass Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| THRSCNC | Threshold Substance Concentration | Threshold Substance Concentration | Adopted from the IUPAC Silver Book 1995” to the code |
| TIME | Time (e.g. seconds) | Time (e.g. seconds) | Adopted from the IUPAC Silver Book 1995” to the code |
| TMDF | Time Difference | Time Difference | Adopted from the IUPAC Silver Book 1995” to the code |
| TMSTP | Time Stamp-Date and Time | Time Stamp-Date and Time | Adopted from the IUPAC Silver Book 1995” to the code |
| TRTO | Time Ratio | Time Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| RCRLTM | Reciprocal Relative Time | Reciprocal Relative Time | Adopted from the IUPAC Silver Book 1995” to the code |
| RLTM | Relative Time | Relative Time | Adopted from the IUPAC Silver Book 1995” to the code |
| ABS | Absorbance | Absorbance | |
| ACT | Activity | Activity | Adopted from the IUPAC Silver Book 1995” to the code |
| APER | Appearance | Appearance | |
| ARB | Arbitrary | Arbitrary | Adopted from the IUPAC Silver Book 1995” to the code |
| AREA | Area | Area | |
| ASPECT | Aspect | Aspect | |
| CLAS | Class | Class | |
| CNST | Constant | Constant | Adopted from the IUPAC Silver Book 1995” to the code |
| COEF | Coefficient | Coefficient | Adopted from the IUPAC Silver Book 1995” to the code |
| COLOR | Color | Color | |
| CONS | Consistency | Consistency | |
| DEN | Density | Density | |
| DEV | Device | Device | |
| DIFF | Difference | Difference | Adopted from the IUPAC Silver Book 1995” to the code |
| 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 | Adopted from the IUPAC Silver Book 1995” to the code |
| LEN | Length | Length | |
| LINC | Length Increment | Length Increment | Adopted from the IUPAC Silver Book 1995” to the code |
| LIQ | Liquefaction | Liquefaction | Adopted from the IUPAC Silver Book 1995” to the code |
| MGFLUX | Magnetic flux | Magnetic flux | |
| MORPH | Morphology | Morphology | |
| MOTIL | Motility | Motility | |
| OD | Optical density | Optical density | |
| OSMOL | Osmolality | Osmolality | Adopted from the IUPAC Silver Book 1995” to the code |
| PRID | Presence/Identity/Existence | Presence/Identity/Existence | |
| PRES | Pressure (Partial) | Pressure (Partial) | Adopted from the IUPAC Silver Book 1995” to the code |
| PWR | Power (wattage) | Power (wattage) | |
| RANGE | Ranges | Ranges | Adopted from the IUPAC Silver Book 1995” to the code |
| RATIO | Ratios | Ratios | Adopted from the IUPAC Silver Book 1995” to the code |
| RDEN | Relative Density | Relative Density | Adopted from the IUPAC Silver Book 1995” to the code |
| REL | Relative | Relative | Adopted from the IUPAC Silver Book 1995” to the code |
| SATFR | Saturation Fraction | Saturation Fraction | Adopted from the IUPAC Silver Book 1995” to the code |
| SHAPE | Shape | Shape | |
| SMELL | Smell | Smell | |
| SUSC | Susceptibility | Susceptibility | Adopted from the IUPAC Silver Book 1995” to the code |
| TASTE | Taste | Taste | |
| TEMP | Temperature | Temperature | Adopted from the IUPAC Silver Book 1995” to the code |
| TEMPDF | Temperature Difference | Temperature Difference | Adopted from the IUPAC Silver Book 1995” to the code |
| TEMPIN | Temperature Increment | Temperature Increment | Adopted from the IUPAC Silver Book 1995” to the code |
| TITR | Dilution Factor (Titer) | Dilution Factor (Titer) | Adopted from the IUPAC Silver Book 1995” to the code |
| TYPE | Type | Type | Adopted from the IUPAC Silver Book 1995” to the code |
| VEL | Velocity | Velocity | Adopted from the IUPAC Silver Book 1995” to the code |
| VELRT | Velocity Ratio | Velocity Ratio | Adopted from the IUPAC Silver Book 1995” to the code |
| VISC | Viscosity | Viscosity | Adopted from the IUPAC Silver Book 1995” to the code |