Arbitrary number (arb.num.)
Abbreviation |
Arb.num. | ||
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Definition in words |
Note 1: This 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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Allegology |
Example 1 (ordinal) | |
Generic abbreviated form | NPU02480 Ercs(B)—Immunoglobulin E; arb.num.(proc.) = ? | |
Full form with a result | NPU02480 Erythrocytes(Blood)—Immunoglobulin E; arbitrary number(procedure) = high | |
Abbreviated form with a result | NPU02480 Ercs(B)—Immunoglobulin E; arb.num.(proc.) = high | |
Written expression | The arbitrary number of Immunoglobulin E of Erythrocytes in Mr Smith’s blood is [high] compared with the arbitrary number of Immunoglobulin E of Erythrocytes in a reference system. The measurement is performed according to a procedure defined by the given laboratory. | |
Notes |
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Clinical Chemistry |
Example 2 (ratio) | |
Generic abbreviated form | NPU18636 U—Ercs; arb.num.(proc.) = ? (p.d.u.) | |
Full form with a result | NPU18636 Urine—Erythrocytes; arbitrary number(procedure) = 70 arbitrary unit | |
Abbreviated form with a result | NPU18636 U—Ercs; arb.num.(proc.) = 70 arbitrary unit | |
Written expression | The arbitrary number of Erythrocytes in Mr Smith’s urine is [70] arbitrary unit. 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 3 (ordinal) | ||
Generic abbreviated form | NPU04063 Lkcs(B)—Aldosterone receptor; arb.num.(proc.) = ? | |
Full form with a result | NPU04063 Leukocytes(Blood)—Aldosterone receptor; arbitrary numbers(procedure) = 2 | |
Abbreviated form with a result | NPU04063 Lkcs(B)—Aldosterone receptor; arb.num.(proc.) = 2 | |
Written expression | The arbitrary number of Aldosterone receptor of Leukocytes in Mr Smith’s blood is [2] compared with the arbitrary number of Aldosterone receptor of Leukocytes in a reference system. The measurement is performed according to a procedure defined by the given laboratory. | |
Notes |
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Clinical Immunology and Blood Bank |
Example 4 (ordinal) | |
Generic abbreviated form | NPU20206 Ercs(B)—Erythrocyte BARC antigen; arb.num.(proc.) = ? | |
Full form with a result | NPU20206 Erythrocytes(Blood)—Erythrocyte BARC antigen; arbitrary number(procedure) = high | |
Abbreviated form with a result | NPU20206 Ercs(B)—Erythrocyte BARC antigen; arb.num.(proc.) = high | |
Written expression | The arbitrary number of Erythrocyte BARC antigen of Erythrocytes in Mr Smith’s blood is [high] compared with the arbitrary number of Erythrocyte BARC antigen of Erythrocytes in a reference system. The measurement is performed according to a procedure defined by the given laboratory. | |
Notes |
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Clinical Microbiology
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Example 5 (ratio) | |
Generic abbreviated form | NPU18642 U—Trichomonas vaginalis; arb.num.(proc.) = ? (p.d.u.) | |
Full form with a result | NPU18642 Urine—Trichomonas vaginalis; arbitrary number(procedure) = 0 arbitrary unit | |
Abbreviated form with a result | NPU18642 U—Trichomonas vaginalis; arb.num.(proc.) = 0 arbitrary unit | |
Written expression | The arbitrary number of Trichomonas vaginalis in Mrs Smith’s urine is [0] arbitrary unit.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 6 (ratio)
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Generic abbreviated form | NPU18891 Sem—Spermatozoa; arb.num.(proc.) = 165 (p.d.u.) | |
Full form with a result | NPU18891 Semen—Spermatozoa; arbitrary number(procedure) = 165 ELISA unit | |
Abbreviated form with a result | NPU18891 Sem—Spermatozoa; arb.num.(proc.) = 165 Elisa unit | |
Written expression | The arbitrary number of Spermatozoa in Mrs Smith’s semen is [165] ELISA unit. The measurement is performed according to a procedure defined by the given laboratory. | |
Equation | ||
Notes | “ELISA 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
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Unitary kind-of-quantity
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Arbitrary number
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Reference |
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Date | Term | Note |
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1996-01-01 | Arbitrary number | Term established |
NPU term identifier |
QU50151 |