Arbitrary number concentration (arb.num.c.)
Arbitrary number concentration |
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Abbreviation |
Arb.num.c. | ||
Definition in words |
Note 1: The concept has two definitions. Note 2: The reference system is defined by the laboratory. |
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Definition by equation |
Note: kprocedure is a constant defined by the measurement procedure (there is an approximately proportionality to a kind-of-quantity from the International System of Quantities) |
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Result type |
Ordinal scale |
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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 can be 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. If ordinal scale is attributed, no unit is stated. |
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Reference |
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Laboratory field |
Examples |
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Clinical Chemistry
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Example 1 (ordinal) |
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Generic abbreviated form | NPU29256 Marrow—Erythroid stem cell(EPO indep.); arb.num.c.(proc.) = ? | |
Full form with a result | NPU29256 Marrow—Erythroid stem cell(EPO independent); arbitrary number concentration(procedure) = low | |
Abbreviated form with a result | NPU29256 Marrow—Erythroid stem cell(EPO indep.); arb.num.c.(proc.) = low | |
Written expression | The arbitrary number concentration of EPO independent Erythroid stem cell in Mr Smith’s Marrow is [low], compared with the arbitrary number concentration of EPO independent Erythroid stem cell in a reference system. The measurement is performed according to a procedure defined by the laboratory. | |
Notes |
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Clinical Microbiology |
Example 2 (ratio) | |
Generic abbreviated form | NPU28905 P—Hepatitis B virus(DNA); arb.num.c.(WHO 97/750; proc.) = ? × 10³ IU/L | |
Full form with a result | NPU28905 Plasma—Hepatitis B virus(DNA); arbitrary number concentration(WHO 97/750; procedure) = 150 × 10³ IU/L | |
Abbreviated form with a result | NPU28905 P—Hepatitis B virus(DNA); arb.num.c.(WHO 97/750; proc.) = 150 × 10³ IU/L | |
Written expression | The arbitrary number concentration of Hepatitis B virus(DNA) in Mr Smith’s plasma is [1.5] × 10³ IU/L. The measurement is performed according to a procedure defined by the given laboratory. The measurement unit is defined by the Certified Reference Material, WHO 97/750. | |
Equation | ||
Example 3 (ratio) | ||
Generic abbreviated form | NPU58268 P—Human immunodeficiency virus 1(RNA); arb.num.c.(proc.) = ? (p.d.u.) | |
Full form with a result | NPU58268 Plasma—Human immunodeficiency virus 1(RNA); arbitrary number concentration(procedure) = 176 arbitrary unit/L | |
Abbreviated form with a result | NPU58268 P—Human immunodeficiency virus 1(RNA); arb.num.c.(proc.) = 176 arbitrary unit/L | |
Written expression | The arbitrary number concentration of Human immunodeficiency virus 1(RNA) in Mr Smith’s plasma is [176] arbitrary unit/L. The measurement is performed according to a procedure defined by the given laboratory. | |
Equation | ||
Notes | “Arbitrary unit” was chosen by a local laboratory as a proprietary measurement unit.and not an accepted international unit. | |
Reproduction and Fertility |
Example 4 (ratio)
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Generic abbreviated form | NPU18199 Sem—Spermatozoa; arb.num.c.(proc.) = ? (p.d.u.) | |
Full form with a result | NPU18199 Semen—Spermatozoa; arbitrary number concentration(procedure) = 100 arbitrary unit/L | |
Abbreviated form with a result | NPU18199 Sem—Spermatozoa; arb.num.c.(proc.) = 100 arbitrary unit/L | |
Written expression | The arbitrary number concentration of Spermatozoa in Mr Smith’s semen is [100] arbitrary unit/L. The measurement is performed according to a procedure defined by the given laboratory. | |
Equation | ||
Notes | “Arbitrary unit” was chosen by a local laboratory as a proprietary measurement unit.and not an accepted international unit. | |
Example 5 (ratio) | ||
Generic abbreviated form | NPU54283 Sem—Spermatozoa(progressively motile); arb.num.c.(Direct swim-up; proc.) = ? (p.d.u.) | |
Full form with a result | NPU54283 Semen—Spermatozoa(progressively motile); arb.num.c.(Direct swim-up; procedure) = 88 arbitrary unit/L | |
Abbreviated form with a result | NPU54283 Sem—Spermatozoa(progressively motile); arb.num.c.(Direct swim-up; proc.) = 88 arbitrary unit/L | |
Written expression | The arbitrary number concentration of Spermatozoa in Mr Smith’s semen is [88] arbitrary unit/L. The measurement is performed according to a procedure defined by the given laboratory. | |
Equation | ||
Notes | “Arbitrary unit” 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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Ordinal kind-of-quantity
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Arbitrary number concentration
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Unitary kind-of-quantity
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Rational kind-of-quantity
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Arbitrary number concentration
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Reference |
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Date | Term | Note |
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1996-01-01 | Arbitrary number concentration | Term established |
NPU term identifier |
QU50104 |