Arbitrary conductivity (arb.conductivity) - Dynamic NPU Manual

Arbitrary conductivity (arb.conductivity)



Definition in words

Arbitrary conductivity of component B in system 1

Note: Electrical conductivity is the reciprocal of resistivity (Ref 1)

Definition by equation

Note 1: kprocedure is a constant defined by the measurement procedure (there is an approximately proportionality to a kind-of-quantity from the International System of Quantities).

Systematic terms

Arbitrary conductivity of component B in system 1

Result type

Rational scale
  • Value sets are positive numerical values
  • Numerical values from 0-∞
  • Algebraic operations are not allowed (Ref. 3, 1.26)
  • Possible comparison of values (a<b, a=b or a>b)


International unit (IU) or procedure defined unit (p.d.u.) (non-SI units).

Special rule(s) in the NPU syntax

“Procedure” is stated in the specification to the kind-of-property in the NPU definition.

“Procedure” indicates that the measurement procedure must be stated somewhere else than the NPU code and there may be difficulties in comparing values for the same NPU code.

If the unit is an International Unit (IU), an international certified reference material (e.g. WHO reference material) is specified in the specification to the kind-of-property.

If there exist no international certified reference material, the laboratory can specify the unit at the placeholder, procedure defined unit.


  1. IUPAC Goldbook homepage.
  2. 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.
  3. Mesures BIdPe. International Vocabulary of Metrology – Basic and General Concepts and Associated Terms VIM 3rd edition JCGM 200:2012 (JCGM 200:2008 with minor corrections). Bureau International des Poids et Mesures; 2008.


Laboratory field


Clinical Chemistry

Generic abbreviated form NPU21552 Sweat(spec.)—Sweat; arb.conductivity(proc.) = ? (p.d.u.)
Full form with a result NPU21552 Sweat(specification)—Sweat; arbitrary conductivity(procedure) = 25 arbitrary unit
Abbreviated form with a result NPU21552 Sweat(spec.)—Sweat; arb.conductivity(proc.) = 25 arbitrary unit
Written expression The arbitrary conductivity of Sweat from Mr. Smith’s right arm is [25] arbitrary unit. The measurement is performed according to a procedure defined by the laboratory,


“Arbitrary unit” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Arbitrary conductivity


  • Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
  • Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.
Date Term Note Reference
1996-01-01 Arbitrary conductivity Term established. NPU database, and