Arbitrary catalytic-activity (arb.cat.act.)
Abbreviation |
Arb.cat.act. | ||
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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 1: Component B is a catalytic component. Note 2: kprocedure=an arbitrary determined factor defined by the method procedure used. |
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Result type |
Ordinal scale |
Example 1 Value set={none<some<high<very high} Example 2 Value set={low<normal<high} Example 3 Value set={0<1<2} Example 4 Value set={negative<positive} Example 5 Value set={+<++<+++} |
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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 |
Component B is termed according to the International Enzyme Nomenclature (see Medical and metrological vocabulary). “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 |
Example 1 (ratio)
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Generic abbreviated |
NPU58186 P—Peptidyl dipeptidase A; arb.cat.act.(37 °C; proc.) = ? (p.d.u.) | |
Full result | NPU58186 Plasma—Peptidyl dipeptidase A; arbitrary catalytic-activity(37 °C; procedure) = 38 ELISA unit | |
Abbreviated result | NPU58186 P—Peptidyl dipeptidase A; arb.cat.act.(37 °C; proc.) = 38 ELISA unit | |
Written expression | The arbitrary catalytic-activity of Peptidyl dipeptidase A in Mr Smith’s plasma is [38] ELISA unit. The measurement is performed at 37 °C according to a procedure defined by the laboratory, | |
Equation | ||
Notes | “ELISA unit” was chosen by a local laboratory as a proprietary measurement unit and not an accepted international unit. | |
Example 2 (ordinal) | ||
Generic abbreviated form | NPU01143 Lkcs(B)—Alkaline phosphatase; arb.cat.act.(proc.) = ? | |
Full form with a result | NPU01143 Leukocytes(Blood)—Alkaline phosphatase; arbitrary catalytic-activity(procedure) = 0 | |
Abbreviated form with a result |
NPU01143 Lkcs(B)—Alkaline phosphatase; arb.cat.act.(proc.) = 0 |
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Written expression | The arbitrary catalytic-activity of alkaline phosphatase in leukocytes of Mr. Smiths blood is [0] compared with arbitrary catalytic-activity of alkaline phosphatase in a reference system. The measurement is performed according to a procedure defined by the laboratory, | |
Notes |
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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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Kind-of-quantity
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Unitary kind-of-quantity
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Rational kind-of-quantity
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arbitrary catalytic-activity
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Ordinal kind-of-quantity
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arbitrary catalytic-activity
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Reference |
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Date | Term | Note | Reference |
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1996-01-01 | Arbitrary catalytic-activity | Term established. | NPU database, https://www.ifcc.org/ifcc-scientific-division/sd-committees/c-npu/npusearch/ and http://www.labterm.dk/default.aspx |
NPU term identifier |
QU50103 |
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Date | Note | Example |
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2019-06-04 | Catalytic component B is an enzyme, defined by the international enzyme nomenclature (https://www.expasy.org/), and shall be used for catalytic-activity kinds-of-property. Proteins are defined and termed by UNIPROT (https://www.uniprot.org/) and should not be used in relation to catalytic-activity kinds-of-property. Though there are overlaps between these two nomenclatures.. |
The enzyme and protein nomenclatures can have different terms for the same molecule.
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