Arbitrary catalytic-activity concentration (arb.cat.c.)

Abbreviation

Arb.cat.c.

Definition in words

Arbitrary catalytic-activity of component B divided by the volume of system 1

Definition by equation

Note 1: Component B is a catalytic component.

Note 2: kprocedure=an arbitrary determined factor defined by the method procedure used.

Systematic terms

Arbitrary catalytic-activity of component B

Result type

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

Component B is termed according to the International Enzyme Nomenclature (see Medical and metrological vocabulary).

“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 an 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.

Laboratory field

Examples

Clinical chemistry

Example 1
Generic abbreviated
NPU54596 Ercs(B)—Thiopurine S-methyltransferase; arb.cat.c.(37 °C; proc.) = ? (p.d.u.)
Full result NPU54596 Erythrocytes(Blood)—Thiopurine S-methyltransferase; arbitrary catalytic-activity concentration(37 °C; procedure) = 25 arbitrary unit/L
Abbreviated result NPU54596 Ercs(B)—Thiopurine S-methyltransferase; arb.cat.c.(37 °C; proc.) = 25 arbitrary unit/L
Written expression The arbitrary catalytic-activity of Thiopurine S-methyltransferase of erythrocytes in Mr. Smith’s blood is [25] arbitrary unit/L. The measurement is performed at 37 °C according to a procedure defined by the laboratory.
Equation
Notes
“Arbitrary unit/L” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.

Clinical Immunology and Blood Banking

Example 2
Generic abbreviated
NPU28569 P—Alternative-complement-pathway C3/C5 convertase; arb.cat.c.(erythrol.; proc.) = ? (p.d.u.)
Full result NPU28569 Plasma—Alternative-complement-pathway C3/C5 convertase; arbitrary catalytic-activity concentration(erythrolysis; procedure) = 200 arbitrary unit/L
Abbreviated form with a result NPU28569 P—Alternative-complement-pathway C3/C5 convertase; arb.cat.c.(erythrol.; proc.) = 200 arbitrary unit/L
Written expression The arbitrary catalytic-activity of Alternative-complement-pathway C3/C5 convertase in Mr. Smith’s plasma is [200] arbitrary unit/L. The measurement is performed according to a procedure defined by the laboratory.
Equation
Notes “Arbitrary unit/L” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.

Molecular Biology and Genetics

Example 3
Generic abbreviated
NPU27632 B—Biotinidase; arb.cat.c.(proc.) = ? (p.d.u.)
Full result NPU27632 Blood—Biotinidase; arbitrary catalytic-activity concentration(procedure) = 75 arbitrary unit/L
Abbreviated result NPU27632 B—Biotinidase; arb.cat.c.(proc.) = 75 arbitrary unit/L
Written expression The arbitrary catalytic-activity of Biotinidase in Mr. Smith’s blood is [75] arbitrary unit/L. The measurement is performed according to a procedure defined by the laboratory.  
Equation
Notes “Arbitrary unit/L” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.

Thrombosis and haemostasis

Example 4
Generic abbreviated form NPU28432 B—Coagulum lysis; arb.cat.c.(tissue f.induc.coag.; proc.) = ? (p.d.u.)
Full form with a result NPU28432 Blood—Coagulum lysis; arbitrary catalytic-activity concentration(Coagulation, tissue factor-induced; procedure) = 10 arbitrary unit/L
Abbreviated form with a result NPU28432 B—Coagulum lysis; arb.cat.c.(tissue f.induc.coag.; proc.) = 10 arbitrary unit/L
Written expression The arbitrary catalytic-activity of Coagulum lysis in Mr. Smith’s blood is [10] arbitrary unit/L. The measurement is performed according to a tissue factor-induced Coagulation procedure defined by the laboratory.
Equation     
Notes “Arbitrary unit/L” was chosen by a local laboratory as a proprietary measurement unit and not an accepted 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

      • Ordinal kind-of-quantity

        • Arbitrary catalytic-activity concentration

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 Reference
1996-01-01 arbitrary catalytic-activity concentration Term established. NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx