Entitic mass - Dynamic NPU Manual
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# Entitic mass

### Definition in words

Mass of component B divided by number of entities (component B or system 1) in a system

Alternative: Average mass of component B in a system or mass of component per system 1 in system 2

### Systematic terms

Entitic mass 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

pg, ng, µg, etc.

Note: The correct unit is e.g. “pg/1” but “1” is omitted.

### 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.

### Clinical Chemistry

Example 1
Generic abbreviated
NPU26879 Rtcs(B)—Haemoglobin; entitic mass = ? pg
Full result NPU26879 Reticulocytes(Blood)—Haemoglobin; entitic mass = 40.4 picogram
Abbreviated result NPU26879 Rtcs(B)—Haemoglobin; entitic mass = 40.4 pg
Written expression The mass of Haemoglobin divided by number of Reticulocytes in Ms. Smith’s Blood is [40.4] pg.
Equation
Notes

Alternative expresssion:

The mass of Haemoglobin per Reticulocyte in Mrs. Smith’s Blood is [40.4] pg.

Example 2
Generic abbreviated
NPU26880 Ercs(B)—Haemoglobin; entitic mass = ? pg
Full result NPU26880 Erythrocytes(Blood)—Haemoglobin; entitic mass = 28 picogram
Abbreviated result NPU26880 Ercs(B)—Haemoglobin; entitic mass = 28 pg
Written expression The mass of Haemoglobin divided by number of Erythrocytes in Ms. Smith’s Blood is [28] pg.
Equation
Notes

Alternative expresssion:

The mass of Haemoglobin per Erythrocytes in Mrs. Smith’s Blood is [28] pg.

### 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 Entitic mass Term established

QU50124