Arbitrary substance rate (arb.sub.rate)

Abbreviation

Arb.sub.rate

Definition in words

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

Definition by equation

Note: kprocedure is a constant defined by the measurement procedure (there is an approximately proportionality to a kind-of-quantity from the International System of Quantities).

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

Unit

International unit (IU) or procedure defined unit (p.d.u.) (non-SI units).

Special rule(s) in the NPU syntax

“Procedure” is stated in the specification to the kind-of-property in the NPU definition.

“Procedure” indicates that the measurement procedure must be stated somewhere else than the NPU code and there may be difficulties in comparing values for the same NPU code.

If the unit is an International Unit (IU), an international certified reference material (e.g. WHO reference material) is specified in the specification to the kind-of-property.

If there exist no international certified reference material, the laboratory can specify the unit at the placeholder, procedure defined unit.

Reference

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

Examples

Clinical Microbiology

Example 1
Generic abbreviated
NPU29226 T-lymcs(B)—Interferon gamma release; arb.sub.rate(stim.; Rv3874; Rv3875; Rv2654c (38-56); IS Gxg01-902-535; proc.) = ? × 103 IU/L
Full result NPU29226 T-lymphocytes(Blood)—Interferon gamma release; arbitrary substance rate(stimulated; Rv3874; Rv3875; Rv2654c (38-56); IS Gxg01-902-535; procedure) = 5 × 103 International Unit per litre
Abbreviated result NPU29226 T-lymcs(B)—Interferon gamma release; arb.sub.rate(stim.; Rv3874; Rv3875; Rv2654c (38-56); IS Gxg01-902-535; proc.) = 5 × 103 IU/L
Written expression The arbitrary substance rate of Interferon gamma release of T-lymphocytes in Mr. Smith’s blood is [5] × 10³ IU/L. The measurement is performed after stimulation with Rv3874; Rv3875; Rv2654c (38-56) in a procedure defined be the laboratory. “IU” and its magnitude is defined by the Certified Reference Material, IS Gxg01-902-535 from WHO.
Equation

Example 2
Generic abbreviated
NPU57225 T-lymcs(B)—Interferon gamma release; arb.sub.rate(stim.; phytohemagglutinin; proc.) = ? (p.d.u.)
Full result NPU57225 T-lymphocytes(Blood)—Interferon gamma release; arbitrary substance rate(stimulated; phytohemagglutinin; procedure) = 0 arbitrary unit per second
Abbreviated result NPU57225 T-lymcs(B)—Interferon gamma release; arb.sub.rate(stim.; phytohemagglutinin; proc.) = 0 arbitrary unit/s
Written expression The arbitrary substance rate of Interferon gamma release of T-lymphocytes in Mr. Smith’s blood is [0] arbitrary unit/second. The measurement is performed after stimulation with phytohemagglutinin by a procedure defined be the laboratory.
Equation

Notes “Arbitrary unit/second” was chosen by a local laboratory as a proprietary measurement unit and not anaccepted international unit.

Reference

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

          • Arbitrary substance rate

Reference

  • 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
2017-10-02 Arbitrary substance rate Term established