Mass rate - Dynamic NPU Manual

Mass rate


Mean mass rate, mass flow rate, mass velocity


Mass c.

Definition in words

Change of mass of component B divided by time elapsed in system 1

Definition by equation

Systematic terms

Mass rate 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-∞


µg/s, mg/hour, g/d, etc.


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.

Laboratory field


Clinical Chemistry


Example 1
Generic abbreviated form NPU19848 Pt(U)—M-component; mass rate(proc.) = ? g/d
Full form with a result NPU19848 Patient(Urine)—M-component; mass rate(procedure) = 1.2 gram per day
Abbreviated form with a result NPU19848 Pt(U)—M-component; mass rate(proc.) = 1.2 g/d
Written expression The mass rate of M-component in Mr. Smith’urine is [1.2] g/d. The measurement is performed according to procedure defined by the laboratory.

Clinical Pharmacology

Example 2
Generic abbreviated form NPU19777 Pt—Gabapentin(administered); mass rate(p.o.) = ? mg/d
Full form with a result NPU19777 Patient—Gabapentin(administered); mass rate(oral administration) = 300 milligram per day
Abbreviated form with a result NPU19777 Pt—Gabapentin(administered); mass rate(p.o.) = 300 mg/d
Written expression The mass rate of oral administered Gabapentin to Mr. Smith is [300] mg/d.


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Unitary kind-of-quantity

        • Rational unitary kind-of-quantity

          • Mass rate


  • 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
1996-01-01 Mass rate Term established