Arbitrary logarithmic number concentration (arb.log.num.c)
Abbreviation |
Arb.log.num.c | ||
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Definition in words |
Logarithm of the arbitrary number concentration of component B in system 1 | ||
Definition by equation |
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Result type |
Rational scale |
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Unit |
International unit (IU) or procedure defined unit (p.d.u.) (non-SI units) | ||
Special rule(s) in the NPU syntax |
“Procedure” is stated in the specification to the kind-of-property 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 non-SI 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 kind-of-property. If there exist no international certified reference material, the laboratory can specify the unit at the placeholder, procedure defined unit. |
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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. |
Laboratory field |
Examples |
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Clinical Microbiology |
Example 1
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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—Tick-borne encephalitis virus(RNA); arb.log.num.c(proc.) = ? (p.d.u.) | |
Full form with a result | NPU58454 Cerebrospinal fluid—Tick-borne encephalitis virus(RNA); arbitrary logarithmic number concentration(procedure) = 0.2 log unit | |
Abbreviated form with a result | NPU58454 Csf—Tick-borne encephalitis virus(RNA); arb.log.num.c(proc.) = 0.2 log unit | |
Written expression | The arbitrary logarithmic number concentration of Tick-borne 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/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx |
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Kind-of-property
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Nominal kind-of-property
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Kind-of-quantity
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Unitary kind-of-quantity
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Logarithmic differential unitary kind-of-quantity
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Arbitrary logarithmic number concentration
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Reference |
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Date | Term | Note |
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2017-12-15 | Arbitrary logarithmic number concentration | Term established |
NPU term identifier |
QU104764 |