Number of entities (num.)
Synonym 
Absolute frequency, number of particles, number of molecules  

Abbreviation 
Num.  
Definition in words 
Number of entities (component B) in system 1 Note 1: Number of entities is not a SI base kindofquantity. In clinical laboratory, it is considered as a base kindofquantity. Note 2: Entities are things with distinct and independent existence Note 3: Entities can be distributed into a category due to their common distinct characteristics 

Definition by equation 

Systematic terms

Number of component B in system 1  
Ratio scale 

Numerical values from 0∞  
Unit 
1 (one), 10^{3}, 10^{6}, 10^{9}, 10^{12}, 10^{15}, 10^{18 }etc. Unit, one (1) is omitted in the NPU syntax 

Nonrecommended term 
Count  
Reference 
Ferard G, Dybkaer R, FuentesArderiu X. Compendium of Terminology and Nomenclature of Properties in Clinical Laboratory Sciences : Recommendations 2016. 1 ed: Royal Society of Chemistry; 2016. 182 p. 
Laboratory field 
Examples 


Clinical Chemistry 
Example 1  
Generic abbreviated 
NPU03843 U—Erythrocytes; num.(proc.) = ? × 10^{6}  
Full result  NPU03843 Urine—Erythrocytes; number of entities(procedure) = 0.5 × 10^{6}  
Abbreviated result  NPU03843 U—Erythrocytes; num.(proc.) = 0.5 × 10^{6}  
Written expression  The number of Erythrocytes in Mrs. Smith’s urine is 0.5 × 10^{6}. The measurement is performed according to a procedure defined by the laboratory.  
Equation  
Reproduction and Fertility 
Example 2  
Generic abbreviated 
NPU03454 Sem—Spermatozoa; num.(proc.) = ? × 10^{6}  
Full result  NPU03454 Semen—Spermatozoa; number of entities(procedure) = 150 × 10^{6}  
Abbreviated result  NPU03454 Sem—Spermatozoa; num.(proc.) = 150 × 10^{6}  
Written expression  The number of Spermatozoa in Mr. Smith’s Semen is 150 × 10^{6}. The measurement is performed according to a procedure defined by the laboratory.  
Equation  
Example 3  
Generic abbreviated 
NPU57215 Sem—Spermatozoa; num.(proc.) = ? × 10^{9}  
Full result  NPU57215 Semen—Spermatozoa; number of entities(procedure) = 0.12 × 10^{9}  
Abbreviated result  NPU57215 Sem—Spermatozoa; num.(proc.) = 0.12 × 10^{9}  
Written expression  The number of Spermatozoa in Mr. Smith’s Semen is 0.12 × 10^{9}. The measurement is performed according to a procedure defined by the laboratory.  
Equation  
Reference 
NPU database, https://www.ifcc.org/ifccscientificdivision/sdcommittees/cnpu/npusearch/ and http://www.labterm.dk/default.aspx 

Kindofproperty

Nominal kindofproperty

Kindofquantity

Unitary kindofquantity

Rational unitary kindofquantity

Number of entities




Reference 

Date  Term  Note 

20190606  Number of entities  Term established 
NPU term identifier 
QU50040 