Compatibility - Dynamic NPU Manual


Definition in words

Tolerance toward non-self entities

Note: “Tolerance” is the ability not to initiate a reaction

Systematic terms

Compatibility of component B in system 1

Result type

Ordinal scale
  • Value set is ranked accoding to magnitude
  • The value set and the limit of the value set are defined by the laboratory
  • The value set can be either numerical values or words.

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={+ < ++ < +++}

  • Algebraic operations are not allowed (Ref. 3, 1.26)
  • Possible comparison of value sets  (a<b, a=b or a>b).



Special rule(s) in the NPU syntax

“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.


  1. Varming K, Forsum U, Bruunshuus I, Olesen H. International Federation of Clinical Chemistry and Laboratory Medicine: Scientific divisioncommittee on Nomenclature, Properties and Units (C-NPU) and International Union of Pure and Applied Chemistry Chemistry and human health division(VII) project number 2001-059-1-700: Properties and Units for Transfusion Medicine and Immunohaematology (Technical report) (IFCC-IUPAC 2003). EJIFCC. 2004;15(1):10-3
  2. 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.
  3. Mesures BIdPe. International Vocabulary of Metrology – Basic and General Concepts and Associated Terms VIM 3rd edition JCGM 200:2012 (JCGM 200:2008 with minor corrections). Bureau International des Poids et Mesures; 2008.

Laboratory field


Clinical Chemistry

Generic abbreviated form NPU21754 Ercs(B)—Erythrocytes; compatibility(P; donationID; absent present) = ?
Full form with a result NPU21754 Erythrocytes(Blood)—Erythrocytes; compatibility(Plasma; donationID; absent present) = present
Abbreviated form with a result NPU21754 Ercs(B)—Erythrocytes; compatibility(P; donationID; absent present) = present
Written expression The compatibility of erythrocytes in Mr Smith’s blood to donationID xxxz1’s plasma is [present]. The measurement is performed according to a procedure defined by the laboratory,
  1. The value set is given as either absent or present.
  2. DonationID is the Identifier of the donated material


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Ordinal kind-of-quantity

        • Compatibility


  • 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 Reference
2010-08-11 Compatibility Term established NPU database, and