Substance rate (subst.rate) - Dynamic NPU Manual

Substance rate (subst.rate)


Substance flow rate



Definition in words

Change of amount-of-substance of component B divided by the time elapsed

Definition by equation

Systematic terms

Substance rate 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-∞


mol/s, mmol/d, µmol/h, etc.

Note: “d” is abbreviation for day that corresponds to 24 hours


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
NPU14043 Pt(U)—Adrenalinium; subst.rate(proc.) = ? µmol/d
Full result NPU14043 Patient(Urine)—Adrenalinium; substance rate(procedure) = 1.2 micromol per day
Abbreviated result NPU14043 Pt(U)—Adrenalinium; subst.rate(proc.) = 1.2 µmol/d
Written expression The substance rate of Adrenalinium, measured in urine, in Mr. Smith is [1.2] µmol/day. The measurement is performed according to a procedure defined by the laboratory

Clinical Phamarcology

Example 2
Generic abbreviated
NPU14175 Pt(U)—Dopamine; subst.rate = ? nmol/d
Full result NPU10138 Patient(Urine)—Dopamine; substance rate =  915 nanomol per day
Abbreviated result NPU10138 Pt(U)—Dopamine; subst.rate = 915 nmol/d
Written expression The substance rate of Dopamine, measured in urine, in Mr. Smith is [915] nmol/day.

Molecular Biology and Genetics

Example 3
Generic abbreviated
NPU17872 Pt(U)—Glycolate; subst.rate = ? µmol/d
Full result NPU17872 Patient(Urine)—Glycolate; substance rate = 115 micromol per day
Abbreviated result NPU17872 Pt(U)—Glycolate; subst.rate = 115 µmol/d
Written expression The substance rate of Glycolate, measured in urine, in Mr. Smith is [115] µmol/day


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Substance rate


  • 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 rate Term established.