Quotient of quantities having the same kind-of-quantity in different systems.
- The denominator quantity is often called the reference quantity.
- Preferentially the same component is found in the numerator and denominator quantity.
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 989 (https://doi.org/10.1351/pac199668040957)