Relative substance concentration (rel.subst.c.)

by | Feb 4, 2020 | List of kinds-of-property, Kind-of-quantity

Relative substance concentration (rel.subst.c.)

Abbreviation

 Rel.subst.c.

Definition in words

Substance concentration of component B in system 1 divided by substance concentration of component B in system 2

Note: System 1 is not related to system 2

Definition by equation

Systematic terms

 Relative substance concentration 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-∞

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

Clinical Chemistry

 

 Example 1
Generic abbreviated
 NPU01523 Csf—Glucose; rel.subst.c.(Csf/P) = ?
Full result NPU01523 Cerebrospinal fluid—Glucose; relative substance concentration(Cerebrospinal fluid/Plasma) = 0.60 x one
Abbreviated result NPU01523 Csf—Glucose; rel.subst.c.(Csf/P) = 0.6
Written expression The relative substance concentration of Glucose in Mr. Smith’s Cerebrospinal fluid is [0.60]. The calculation is performed by dividing substance concentration of Glucose in Mr. Smith’s Cerebrospinal fluid with the substance concentration of Glucose in Mr. Smith’s plasma.
Equation

Clinical Immunology and Biobanking

 Example 2
Generic abbreviated
 NPU26790 P—Complement C1 esterase inhibitor(active); rel.subst.c.(actual/norm; proc.) = ?
Full result NPU26790 Plasma—Complement C1 esterase inhibitor(active); relative substance concentration(actual/norm; procedure) = 1.6 x one
Abbreviated result NPU26790 P—Complement C1 esterase inhibitor(active); rel.subst.c.(actual/norm; proc.) = 1.6
Written expression The relative substance concentration of Complement C1 esterase inhibitor(active) in Mr. Smith’s Plasma is [1.6]. The calculation is performed by dividing substance concentration of Complement C1 esterase inhibitor(active) in Mr. Smith’s plasma (actual) with the substance concentration of Complement C1 esterase inhibitor(active) in a norm (reference system).
Equation

Notes

“Actual” refers to the Mr. Smith’s result.

“Norm” is a reference system that is defined by the laboratory.

Clinical Microbiology

 
Example 3
Generic abbreviated
 NPU12323 Csf—Borrelia burgdorferi antibody(IgG); rel.subst.c.(Csf/P) = ?
Full result NPU12323 Cerebrospinal fluid—Borrelia burgdorferi antibody(Immunoglobulin G); relative substance concentration(Cerebrospinal fluid/Plasma) = 0 x one
Abbreviated result NPU12323 Csf—Borrelia burgdorferi antibody(IgG); rel.subst.c.(Csf/P) = 0
Written expression The relative substance concentration of Borrelia burgdorferi antibody(IgG) in Mr. Smith’s Cerebrospinal fluid is [0]. The calculation is performed by dividing substance concentration of Borrelia burgdorferi antibody(IgG) in Mr. Smith’s plasma with the substance concentration of Borrelia burgdorferi antibody(IgG) in Mr. Smith’s plasma.
Equation

Thrombosis and Haemostasis

 Example 4
Generic abbreviated
 NPU18918 P—Von Willebrand factor; rel.subst.c.(imm.; actual/norm; proc.) = ?
Full result NPU18918 Plasma—Von Willebrand factor; relative substance concentration(immunology; actual/norm; procedure) = 0.79 x one
Abbreviated result NPU18918 P—Von Willebrand factor; rel.subst.c.(imm.; actual/norm; proc.) = 0.79
Written expression The relative substance concentration of Von Willebrand factor in Mr. Smith’s Plasma is [0.79]. The calculation is performed by dividing substance concentration of Von Willebrand factor in Mr. Smith’s plasma (actual) with the substance concentration of Von Willebrand factor in a norm (reference system).
Equation
Notes

“Actual” refers to the Mr. Smith’s result.

“Norm” is a reference system that is defined by the laboratory.

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

          • Relative substance 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
1996-01-01 Relative substance concentration Term established

NPU term identifier

 QU50005