Relative amount-of-substance (rel.ams.)

Abbreviation

Rel.ams.

Definition in words

Amount-of-substance of component B in system 1 divided by amount-of-substance of component B in system 2

Note: System 1 is not related to system 2

Definition by equation

Systematic terms

Relative amount-of-substance 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
NPU01699 Pt(U)—57Co-Cobalamin; rel.ams.(57Co-B12 and IF p.o.; U 1 d/intake; proc.) = ?
Full result NPU01699 Patient(Urine)—57Co-Cobalamin; relative amount-of-substance(57Co-B12 and Intrinsic Factor oral administration.; Urine after 1 day/intake; procedure) = 0.35 x one
Abbreviated result NPU01699 Pt(U)—57Co-Cobalamin; rel.ams.(57Co-B12 and IF p.o.; U 1 d/intake; proc.) = 0.35
Written expression The relative amount-of-substance of 57Co-Cobalamin in Mr. Smith’s urine is [0.35]. 57Co-B12 and IF are oral administrated. The calculation is performed by dividing the amount-of-substance of 57Co-Cobalamin in urine after 1 day with the amount-of-substance of 57Co-Cobalamin at intake. The measurement is performed according to procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated
NPU02152 U—Galactose; rel.ams.(U 300 min/administration; proc.) = ?
Full result NPU02152 Urine—Galactose; relative amount-of-substance(Urine 300 min/administration; procedure) = ?
Abbreviated result NPU02152 U—Galactose; rel.ams.(U 300 min/administration; proc.) = ?
Written expression The relative amount-of-substance of Galactose in Mr. Smith’s urine is [0.35]. The calculation is performed by dividing the amount-of-substance of Galactose in urine after 300 min with the amount-of-substance of administrered Galactose. 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 amount-of-substance

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 amount-of-substance Term established