Reciprocal relative time (recip.rel.time)

Abbreviation

Recip.rel.time

Definition in words

Time of component B in system 2 divided by time of component in system 1

Note 1: System 1 is unrelated to system 2

Note 2: System 2 can be a reference system (also called “norm”) that is defined by the laboratory

Definition by equation

Systematic terms

Reciprocal relative time 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-∞

Unit

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

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

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

Thrombosis and Haemostasis

Example 1
Generic abbreviated
NPU01680 P—Coagulation, surface-induced; recip.rel.time(norm/actual; proc.) = ?
Full result NPU01680 Plasma—Coagulation, surface-induced; reciprocal relative time(norm/actual; procedure) = 1.25 x one
Abbreviated result NPU01680 P—Coagulation, surface-induced; recip.rel.time(norm/actual; proc.) = 1.25
Written expression The reciprocal relative time of surface-induced Coagulation in Mr. Smith’s plasma is [1.25]. The calculation is performed by dividing the time of surface-induced Coagulation in a norm (reference system) with the time of surface-induced Coagulation in Mr. Smith’s plasma. The measurement is performed according to procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated
NPU27548 P—Coagulation, tissue factor-induced; recip.rel.time(norm/actual; II+V+VII+X; proc.) = ?
Full result NPU27548 Plasma—Coagulation, tissue factor-induced; reciprocal relative time(norm/actual; II+V+VII+X; procedure) = 1.11 x one
Abbreviated result NPU27548 P—Coagulation, tissue factor-induced; recip.rel.time(norm/actual; II+V+VII+X; proc.) = 1.11
Written expression The reciprocal relative time of tissue factor-induced Coagulation in Mr. Smith’s plasma is [1.11]. The calculation is performed by dividing the time of tissue factor-induced Coagulation in a norm (reference system) with the time of tissue factor-induced Coagulation in Mr. Smith’s plasma. The measurement is performed according to procedure defined by the laboratory.
Equation

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

          • Reciprocal relative time

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
1996-01-01 Reciprocal relative time Term established