Relative distribution width - Dynamic NPU Manual
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# Relative distribution width

### Definition in words

Distribution width of component B in system 1 divided by distribution width of component B in system 2

Note: System 1 is not related to system 2

### Systematic terms

Relative distribution width 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.

### Clinical Chemistry

Example 1
Generic abbreviated
NPU18100 Trcs(B)—Thrombocyte volumes; relative distribution width(proc.) = ?
Full result NPU18100 Thrombocytes(Blood)—Thrombocyte volumes; relative distribution width(procedure) = 0.35 x one
Abbreviated result NPU18100 Trcs(B)—Thrombocyte volumes; relative distribution width(proc.) = 0.35
Written expression The relative distribution width of Thrombocyte volumes in Mr. Smith’s blood is [0.35]. The measurement is performed according to procedure defined by the laboratory.
Equation

Example 2
Generic abbreviated
NPU18162 Ercs(B)—Erythrocyte volumes; relative distribution width(proc.) = ?
Full result NPU18162 Erythrocytes(Blood)—Erythrocyte volumes; relative distribution width(procedure) = 0.75 x one
Abbreviated result NPU18162 Ercs(B)—Erythrocyte volumes; relative distribution width(proc.) = 0.75
Written expression The relative distribution width of Erythrocyte volumes in Mr. Smith’s blood is [0.75]. 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

• ## Kind-of-quantity

### 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
2000-06-09 Relative distribution width Term established

QU71424