Arbitrary logarithmic number concentration (arb.log.num.c)
Abbreviation 
Arb.log.num.c  

Definition in words 
Logarithm of the arbitrary number concentration of component B in system 1  
Definition by equation 


Result type 
Ratio scale 


Unit 
International unit (IU) or procedure defined unit (p.d.u.) (nonSI units)  
Special rule(s) in the NPU syntax 
“Procedure” is stated in the specification to the kindofproperty in the NPU definition. “Procedure” indicates that the measurement procedure must be stated somewhere else than the NPU code and there may be difficulties in comparing values for the same NPU code. If the ratio scale is attributed to the NPU definition, the unit is a nonSI unit. If the unit is an International Unit (IU), an international certified reference material (e.g. WHO reference material) is specified in the specification to the kindofproperty. If there exist no international certified reference material, the laboratory can specify the unit at the placeholder, procedure defined unit. 

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 Microbiology 
Example 1


Generic abbreviated form  NPU57952 P—Cytomegalovirus(DNA); arb.log.num.c.(proc.) = ? (p.d.u.)  
Full form with a result  NPU57952 Plasma—Cytomegalovirus(DNA); arbitrary logarithmic number concentration(procedure) = 10 logs  
Abbreviated form with a result  NPU57952 P—Cytomegalovirus(DNA); arb.log.num.c.(proc.) = 10 logs  
Written expression  The arbitrary logarithmic number concentration of Cytomegalovirus(DNA) in Mr Smith’s plasma is [10] logs. The measurement is performed according to a procedure defined by the given laboratory.  
Equation  
Notes  “Logs” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.  
Example 2  
Generic abbreviated form  NPU58454 Csf—Tickborne encephalitis virus(RNA); arb.log.num.c(proc.) = ? (p.d.u.)  
Full form with a result  NPU58454 Cerebrospinal fluid—Tickborne encephalitis virus(RNA); arbitrary logarithmic number concentration(procedure) = 0.2 log unit  
Abbreviated form with a result  NPU58454 Csf—Tickborne encephalitis virus(RNA); arb.log.num.c(proc.) = 0.2 log unit  
Written expression  The arbitrary logarithmic number concentration of Tickborne encephalitis virus(RNA) in Mr Smith’s cerebrospinal fluid is [0.2] log unit. The measurement is performed according to a procedure defined by the given laboratory.  
Equation  
Notes  “Logs” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit.  
Reference 
NPU database, https://www.ifcc.org/ifccscientificdivision/sdcommittees/cnpu/npusearch/ and http://www.labterm.dk/default.aspx 

Kindofproperty

Nominal kindofproperty

Kindofquantity

Unitary kindofquantity

Logarithmic differential unitary kindofquantity

Arbitrary logarithmic number concentration




Reference 

Date  Term  Note 

20171215  Arbitrary logarithmic number concentration  Term established 
NPU term identifier 
QU104764 