Substance rate ratio (subst.rate ratio) - Dynamic NPU Manual

Substance rate ratio (subst.rate ratio)


subst.rate ratio

Definition in words

Substance rate of component F divided by substance rate of component G in system 1

Note 1: Component F ≠ Component G (≠ = “not equal to”)

Note 2: Component F ∉ Component G (∉ = “is not an element of”)

Note 3: The quotient of substance rate of component F and substance rate of component G is denoted “substance rate ratio of component B”

Definition by equation

Systematic terms

Substance rate ratio 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-∞


10-6, 10-3, 1 (one), 103, 106, etc.

Unit, one (1) is omitted in the NPU syntax


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

Generic abbreviated form NPU10002 Pt(U)—3-Methoxyadrenalinium/Creatininium; subst.rate ratio(proc.) = ? × 10-6
Full form with a result NPU10002 Patient(Urine)—3-Methoxyadrenalinium/Creatininium; substance rate ratio(procedure) = 140 × 10-6
Abbreviated form with a result NPU10002 Pt(U)—3-Methoxyadrenalinium/Creatininium; subst.rate ratio(proc.) = 140 × 10-6
Written expression The substance rate ratio of 3-Methoxyadrenalinium/Creatininium of Mr. Smith, measured in urine, is [140] × 10-6. The measurement is performed according to a procedure defined by the laboratory.


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Substance rate ratio


  • 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 ratio Term established