Pattern of crystallization - Dynamic NPU Manual

Pattern of crystallization

Definition in words

Structure of component B after formation of crystals compared to structure of a reference system after formation of crystals

Systematic terms

Pattern of crystallization 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 1Value 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. 2, 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. 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.
  2. 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


Reproduction and Fertility

Generic abbreviated form NPU01526 CerMu—Ferning; pattern of crystallization(proc.) = ?
Full form with a result NPU01526 Cervical Mucus—Ferning; pattern of crystallization(procedure) = 2
Abbreviated form with a result NPU01526 CerMu—Ferning; pattern of crystallization(proc.) = 2
Written expression The pattern of crystallization of Ferning in Mrs. Smith’s Cervical Mucus is [2]. The measurement is performed according to procedure defined by the laboratory.
Notes “Fern test” is the indication or trivial name for this examination.


NPU database, and
  • Kind-of-property

    • Nominal kind-of-property

    • Kind-of-quantity

      • Ordinal kind-of-quantity

        • Pattern of crystallization


  • 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
1996-01-01 Pattern of crystalization Term established NPU database, and