Catalytic activity of the component divided by the volume of the system.
- In clinical chemistry @[email protected] is recommended as unit for the volume.
- In clinical chemistry the component is usually an enzyme.
- The term @[email protected] is accepted for use in clinical chemistry.
- Use of the term level as a synonym for concentration is deprecated.
- In describing a quantity, @[email protected] must be clearly differentiated from @[email protected]