Volume rate ratio (vol.rate ratio) - Dynamic NPU Manual

Volume rate ratio (vol.rate ratio)


Vol.rate ratio

Definition in words

Volume rate ratio of component B in system 1

(The volume rate of component F divided by volume of component G in system 1)

Definition by equation

Note 1: Component B is the quotient of component F and component G

Note 2: Component F ≠ Component G (≠ = “not equal to”)

Note 3: Component F ∉ Component G (∉ = “is not an element of”)

Result type

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


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

Special rule(s) in the NPU syntax

Component B is epressed as: “Component F/Component G,” using “/” as a symbol for division

The unit “1” (one) is ommited in the NPU syntax.


  • IUPAC Goldbook homepage. http://goldbook.iupac.org/html/A/A00297.html
  • SI brochure “Unit of amount of substance (mole)” (Avogadro constant) https://www.bipm.org/en/publications/si-brochure/mole.html
  • Lehmann HP, Fuentes-Arderiu X, Bertello L. Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996). Pure and Applied Chemistry. 2009;68(4):957-1000. doi:10.1351/pac199668040957.
  • 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 fields


Clinical Chemistry

Example 1
Generic abbreviated
NPU04125 Kidn.—Albumin clearance/Creatininium clearance; vol.rate ratio = ? × 10-3
Full result NPU04125 Kidneys—Albumin clearance/Creatininium clearance; volume rate ratio = 10 × 10-3
Abbreviated result NPU04125 Kidn.—Albumin clearance/Creatininium clearance; vol.rate ratio = 10 × 10-3
Written expression The volume rate ratio of Albumin clearance/Creatininium clearance of Mr. Smith’s kidneys is [10] × 10-3
Example 2
Generic abbreviated
NPU28835 Kidn.—Calcium-clearance/Creatininum-clearance; vol.rate ratio = ?
Full result NPU28835 Kidneys—Calcium-clearance/Creatininum-clearance; volume rate ratio = 0.15
Abbreviated result NPU28835 Kidn.—Calcium-clearance/Creatininum-clearance; vol.rate ratio = 0.15
Written expression The volume rate ratio of Calcium-clearance/Creatininum-clearance of Mr. Smith’s kidneys is [0.15]


NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Volume 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 Volume rate ratio Term established
Date Notes