Mass fraction (mass fr.) - Dynamic NPU Manual
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# Mass fraction (mass fr.)

Mass fr.

### Definition in words

The mass of component B divided by the mass of system 1

### Systematic terms

Mass fraction of component B in system 1

### Result type

Ratio scale
• Value sets are positive numerical values
• Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-1

### Unit

10-18, 10-15, 10-12, 10-9, 10-6, 10-3, 1 (one), etc.

Unit, one (1) is omitted 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.

### Allergology

Example 1
Generic abbreviated
NPU14874 Dust(Floor)—Horse(ag); mass fr. = ? × 10-9
Full result NPU14874 Dust(Floor)—Horse(antigen); mass fraction = 164 × 10-9
Abbreviated result NPU14874 Dust(Floor)—Horse(ag); mass fr. = 164 × 10-9
Written expression The mass fraction of Horse(antigen) of Dust from Mr. Smith’s floor is [164] ×10-9.
Equation

Notes
The unit “10-9” represents various expressions for the same unit and magnitude,

### Clinical Chemistry

Example 2
Generic abbreviated
NPU19717 F—Calprotectin; mass fr. = ? ×10-6
Full result NPU19717 Faeces—Calprotectin; mass fraction = 55 ×10-6
Abbreviated result NPU19717 F—Calprotectin; mass fr. = 55 ×10-6
Written expression The mass fraction of Calprotectin in Mr. Smith’s Faeces is [55] ×10-6.
Equation

Notes

The unit “10-6” represents various expressions for the same unit and magnitude,

### Clinical Pharmacology

Example 3
Generic abbreviated
NPU53584 Hair—Amfetamine; mass fr. = ? × 10-6
Full result NPU53584 Hair—Amfetamine; mass fraction = 3.6 × 10-6
Abbreviated result NPU53584 Hair—Amfetamine; mass fr. = 3.6 × 10-6
Written expression The mass fraction of Amfetamine in Mr. Smith’s Hair is [3.6] ×10-6.
Equation
Notes The unit “10-6” represents various expressions for the same unit and magnitude,

### 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
1996-01-01 Mass fraction Term established

QU50027