Relative number concentration (rel.num.c.) - Dynamic NPU Manual

Relative number concentration (rel.num.c.)

Abbreviation

Rel.num.c.

Definition in words

Number concentration of component B in system 1 divided by number concentration of component B in system 2

Note: System 1 is not related to system 2

Definition by equation

Systematic terms

Relative number concentration 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

Clinical Chemistry

Example 1
Generic abbreviated
NPU21415 Culture(Lymcs; B)—Candida albicans stimulated lymphocytes; rel.num.c.(stim./unstim.; proc.) = ?
Full result NPU21415 Culture(Lymphocytes; Blood)—Candida albicans stimulated lymphocytes; relative number concentration(stimulated/unstimulated; procedure) = 0.12 x one
Abbreviated result NPU21415 Culture(Lymcs; B)—Candida albicans stimulated lymphocytes; rel.num.c.(stim./unstim.; proc.) = 0.12
Written expression The relative number concentration of Candida albicans stimulated lymphocytes from Mrs. Smith’s blood is [0.12]. The calculation is performed by dividing the number concentration of lymphocytes in Candida albicans stimulated culture with the number concentration of lymphocytes in unstimulated culture. The measurement is performed according to procedure defined by the laboratory.
Equation
Example 2
Generic abbreviated
NPU21418 Culture(Lymcs; B)—Tetanus toxoid stimulated lymphocytes; rel.num.c.(stim./unstim.; proc.) = ?
Full result NPU21418 Culture(Lymphocytes; Blood)—Tetanus toxoid stimulated lymphocytes; relative number concentration(stimulated/unstimulated; procedure) = 0.45 x one
Abbreviated result NPU21418 Culture(Lymcs; B)—Tetanus toxoid stimulated lymphocytes; rel.num.c.(stim./unstim.; proc.) = 0.45
Written expression The relative number concentration of Tetanus toxoid stimulated lymphocytes from Mrs. Smith’s blood is [0.45]. The calculation is performed by dividing the number concentration of lymphocytes in Tetanus toxoid stimulated culture with the number concentration of lymphocytes in unstimulated culture. 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

          • Relative number 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 number concentration Term established