Number content (num.cont.) - Dynamic NPU Manual

Number content (num.cont.)



Definition in words

The number of component B divided by mass of system 1

Definition by equation

Systematic terms

Number content of component B in system 1

Result type

Rational scale
  • Value sets are positive numerical values
  • Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞


1018/kg, 1015/kg, 1012/kg, 109/kg, 1/kg etc.


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.

Laboratory field


Clinical Microbiology

Example 1
Generic abbreviated
NPU04031 F—Enterobius vermicularis(egg); num.cont.(proc.) = ? × 1/kg
Full result NPU04031 Faeces—Enterobius vermicularis(egg); number content(procedure) = 13 × one per kilogram
Abbreviated result NPU04031 F—Enterobius vermicularis(egg); num.cont.(proc.) = 13 × 1/kg
Written expression The number content of Enterobius vermicularis(egg) in Mr. Smith’s Faeces is [13] 1/kg. The measurement is performed according to procedure defined by the laboratory.

Molecular Biology and Genetics

Example 2
Generic abbreviated
NPU58409 RNA(Intestine; spec.)—TNF gene; num.cont. = ? × 109/kg
Full result NPU58409 RNA(Intestine; specification)—TNF gene; number content = 75 × 109 per kilogram
Abbreviated result NPU58409 RNA(Intestine; spec.)—TNF gene; num.cont. = 75 × 109/kg
Written expression The number content of TNF gene in RNA from Mr. Smith’s small Intestine is [75] × 109/kg.


  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Number content


  • 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
1996-01-01 Number content Term established