Threshold substance concentration (threshold subst.c.)
Abbreviation |
Threshold subst.c. | ||
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Definition in words |
Lowest value of substance concentration of component B in system 1 to stimulate a specific reaction Note 1: “Threshold is a modifier indicating that the kind-of-property is defined as the lowest value of a property eliciting a reaction given by the component and specified by the procedure” (Ref 1) Note 2: The “specified reaction” must be described somewhere else than in the NPU syntax |
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Definition by equation
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Systematic terms
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Threshold mass concentration of component B in system 1 | ||
Result type |
Rational scale |
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Numerical values from 0-∞ |
Unit |
µmol/L, mmol/L, mol/L etc. | ||
Reference |
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Laboratory field |
Examples |
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Clinical Microbiology
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Example 1 | |
Generic abbreviated |
NPU13569 Syst—Tobramycin; threshold subst.c. = ? µmol/L | |
Full result | NPU13569 System—Tobramycin; threshold substance concentration = 1.4 micromol per liter | |
Abbreviated result | NPU13569 Syst—Tobramycin; threshold subst.c. = 1.4 µmol/L | |
Written expression | The threshold substance concentration of Tobramycin in Mrs. Smith’s system is [1.4] µmol/L. | |
Equation
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Thrombosis and Haemostasis
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Example 2
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Generic abbreviated |
NPU01109 Trcs(B)—Aggregation, arachidonate-induced; threshold subst.c.(proc.) = ? µmol/L | |
Full result | NPU01109 Thrombocytes(Blood)—Aggregation, arachidonate-induced; threshold substance concentration(procedure) = 25 micromol per liter | |
Abbreviated result | NPU01109 Trcs(B)—Aggregation, arachidonate-induced; threshold subst.c.(proc.) = 25 µmol/L | |
Written expression | The threshold substance concentration of Arachidonate inducing aggregation by Thrombocytes in Mr. Smith’s Blood is [25] µmol/L. The measurement is performed by a procedure defined by the laboratory. | |
Equation | ||
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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Rational unitary kind-of-quantity
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Threshold substance concentration
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Reference |
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Date | Term | Note |
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1996-01-01 | Threshold substance concentration | Term established |
NPU term identifier |
QU50006 |