Substance content (subst.cont.) - Dynamic NPU Manual
Substance content (subst.cont.)



Definition in words

Amount-of-substance of component B divided by mass of system 1

Definition by equation

Systematic terms

Substance content of component B in system 1
Ratio scale
  • Value sets are positive numerical values
  • Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞


fmol/kg, pmol/kg, nmol/kg, μmol/kg, mmol/kg, mol/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. doi:10.1039/9781782622451.

Laboratory field


Clinical Chemistry


Example 1
Generic abbreviated
NPU18145 F—Coproporphyrin I; subst.cont. = ? µmol/kg
Full esult NPU18145 Faeces—Coproporphyrin I; substance content = 324 micromol per kilogram
Abbreviated result NPU18145 F—Coproporphyrin I; subst.cont. = 324 µmol/kg
Written expression The substance content of Coproporphyrin I in Mr. Smith’s faeces is [324] µmol/kg.

Clinical Pharmacology

Example 2
Generic abbreviated
NPU29265 DNA(spec.)—Thioguanine; subst.cont. = ? µmol/kg
Full result NPU29265 DNA(specification)—Thioguanine; substance content = 17.2 micromol per kilogram
Abbreviated result NPU29265 DNA(spec.)—Thioguanine; subst.cont. = 17.2 µmol/kg
Written expression The substance content of Thioguanine in DNA from Mr. Smith’s blood is [17.2] µmol/kg.

  The laboratory has specified that the DNA derives from blood.

Clinical Toxicology

Example 3
Generic abbreviated
NPU02700 Hair—Mercury; subst.cont. = ? µmol/kg
Full result NPU02700 Hair—Mercury; substance content = 4.99 micromol per kilogram
Abbreviated result NPU02700 Hair—Mercury; subst.cont. = 4.99 µmol/kg
Written expression The substance content of Mercury in Mr. Smith’s hair is [4.99] µmol/kg.

Molecular Biology and Genetics

Example 4
Generic abbreviated
NPU17790 Placenta—Copper; subst.cont. = ? µmol/kg
Full result NPU17790 Placenta—Copper; substance content = 15 micromol per kilogram
Abbreviated result NPU17790 Placenta—Copper; subst.cont. = 15 µmol/kg
Written expression The substance content of Copper in Mrs. Smith’s placenta is [15] µmol/kg.


NPU database, and


  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Substance 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 Substance content Term established