Relative time ratio (rel. time ratio) - Dynamic NPU Manual
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Relative time ratio (rel. time ratio)

Rel. time ratio

Definition in words

Time ratio of component B in system 1 divided by time ratio of component B in system 2

Note 1: System 1 is not related to system 2

Note 2: Component F ≠ Component G (≠ = “not equal to”)

Note 3: Component F ∉ Component G (∉ = “is not an element of”)

Where

Systematic terms

Relative time ratio of component B in system 1

Result type

Rational scale
• Value sets are positive numerical values
• Algebraic operations are allowed (a=nb; a≠nb)
Numerical values from 0-∞

Unit

10-6, 10-3, 1 (one), 103, 106, etc.

The unit “1” (one) is ommited in the NPU syntax.

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. Doi:10.1039/9781782622451.

Thrombosis and Haemostasis

Example 1
Generic abbreviated
NPU57071 P—Coagulation, russelactivase X-induced; rel. time ratio(without/with phospholipid incub.; actual/norm; proc.) = ?
Full result NPU57071 Plasma—Coagulation, russelactivase X-induced; relative time ratio(without/with phospholipid incubation; actual/norm; procedure) = 0.96 x one
Abbreviated result NPU57071 P—Coagulation, russelactivase X-induced; rel. time ratio(without/with phospholipid incub.; actual/norm; proc.) = 0.96
Written expression The relative time ratio of Coagulation, russelactivase X-induced without and with phospholipid incubation in Mrs. Smith’s Plasma is [0.96]. The calculation is performed by dividing the time ratio of Coagulation, russelactivase X-induced (without/with phospholipid incub.) in Mr. Smith’s Plasma (actual) with the time ratio of Coagulation, russelactivase X-induced with phospholipid incubation in a norm (reference system)The measurement is performed according to procedure defined by the laboratory.
Equation

Notes

“Actual” refers to the Mr. Smith’s result. “Norm” is a reference system that is defined by the laboratory.

Example 2
Generic abbreviated
NPU57086 P—Coagulation, surface-induced(Silicon dioxide); rel. time ratio(without/with phospholipid incub.; actual/norm; proc.) = ?
Full result NPU57086 Plasma—Coagulation, surface-induced(Silicon dioxide); relative time ratio(without/with phospholipid incubation; actual/norm; procedure) = 0.64
Abbreviated result NPU57086 P—Coagulation, surface-induced(Silicon dioxide); rel. time ratio(without/with phospholipid incub.; actual/norm; proc.) = 0.64
Written expression The relative time ratio of Coagulation, surface-induced(Silicon dioxide) without and with phospholipid incubation in Mrs. Smith’s Plasma is [0.64]. The calculation is performed by dividing the time ratio of Coagulation, surface-induced(Silicon dioxide) without phospholipid incubation  in Mr. Smith’s Plasma (actual) with the time ratio of Coagulation, surface-induced(Silicon dioxide) with phospholipid incubation in a norm (reference system)The measurement is performed according to procedure defined by the laboratory.
Equation

Notes

“Actual” refers to the Mr. Smith’s result. “Norm” is a reference system that is defined by the laboratory.

• Kind-of-property

• Kind-of-quantity

Reference

• Dybkaer R. Concept system on ‘quantity’: formation and terminology. Accredit Qual Assur. 2013;18(3):253-60.
• Dybkaer R. ISO terminological analysis of the VIM3 concepts ‘quantity’ and ‘kind-of-quantity’. Metrologia. 2010;47(3):127-34.
Date Term Note
2016-12-14 Relative time ratio Term established

QU103727