Ordinal scale - Dynamic NPU Manual

Ordinal scale

Definition Quantity, defined by a conventional measurement procedure for which a total ordering relation can be established, according to magnitude, with other quantities of the same kind, but for which no algebraic operations among those quantities exist
Scope An ordinal scale serves for the comparison of examined values regarding a kind-of-property that can be ordered by magnitude.

The results are presented with alphabetic letters or numerical values in a hierarchal way.

Ordinal scale is mainly attributed to NPU codes with arbitrary kinds-of-quantity.

Results that have an arbitrary magnitude and are presented as numerical values express an ordered rank. Most important the numerical values cannot be added, subtracted, divided or multiplied, and the difference between two values is not the same between the numerical values.

Value set
Results with numbers


Results with alphabetic letters

{none<little<much<very much}.


Reference Ferard G, Dybkaer R, Fuentes-Arderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. doi:10.1039/9781782622451.
Date established  
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  • arbitrary activity
  • arbitrary amount-of-substance
  • arbitrary concentration
  • arbitrary catalytic activity
  • arbitrary catalytic-activity concentration
  • arbitrary content
  • arbitrary entitic amount-of-substance
  • arbitrary entitic number
  • arbitrary fraction
  • arbitrary number
  • arbitrary number concentration
  • arbitrary number fraction
  • arbitrary rate
  • arbitrary threshold concentration
  • arbitrary time
  • arbitrary viscosity
  • category
  • compatibility
  • expiry
  • kind-of-property
  • motility
  • presence
  • relative substance fraction
  • susceptibility