6.6 Expressions With Concrete Values

Please note that concrete values are currently not supported in the SNOMED CT International Release. A technical preview of the SNOMED CT International Edition with concrete domains is now available for evaluation purposes. See February 2021 SNOMED CT International Edition Concrete Domains Technical Preview release available.

New attributes that are added to the SNOMED CT concept model (or to a SNOMED CT extension) may require their value to be concrete. Concrete values include integers (e.g. 500), decimals (e.g. 2.75), strings (e.g. "PANADOL"), and booleans (e.g. TRUE¹ .

The expression shown below uses both concept values and concrete values to represent a product containing precisely 500 milligram amoxicillin per oral tablet. In this case, the dose form, the active ingredient, the basis of strength substance, and the strength unit all use a concept as their value, while the strength numerator and denominator are represented using a numeric value. Furthermore, the |Count of base of active ingredient| also uses a numeric value, and represents the number of substances that is the part of the ingredient that the strength of a given product is based upon. The numeric values are indicated in the expression by the preceding '#' symbol (e.g. #500).

778317004 |Product containing only amoxicillin in oral dose form (medicinal product form)| :
         411116001 |Has manufactured dose form (attribute)| = 421026006 |Conventional release oral tablet (dose form)| ,
         763032000 |Has unit of presentation (attribute)| = 732936001 |Tablet (unit of presentation)| ,
         1142139005 |Count of base of active ingredient (attribute)| = #1,
         766939001 |Plays role (attribute)| = 787994008 |Antibacterial therapeutic role (role)|
            { 762949000 |Has precise active ingredient (attribute)| = 372687004 |Amoxicillin (substance)| ,
               732943007 |Has basis of strength substance (attribute)| = 372687004 |Amoxicillin (substance)| ,
               1142135004 |Has presentation strength numerator value (attribute)| = #500,
               732945000 |Has presentation strength numerator unit (attribute)| = 258684004 |milligram (qualifier value)| ,
               1142136003 |Has presentation strength denominator value (attribute)| = #1,
               732947008 |Has presentation strength denominator unit (attribute)| = 732936001 |Tablet (unit of presentation)| }

The expression below represents a medicinal product that contains precisely chlorhexidine diacetate 10 milligrams per gram conventional release cutaneous powder.

    778726003 |Product containing only chlorhexidine in cutaneous dose form (medicinal product form)| :
         411116001 |Has manufactured dose form (attribute)| = 385112003 |Conventional release cutaneous powder (dose form)| ,
         1142139005 |Count of base of active ingredient (attribute)| = #1
            { 762949000 |Has precise active ingredient (attribute)| = 96317008 |Chlorhexidine diacetate (substance)| ,
               732943007 |Has basis of strength substance (attribute)| = 96317008 |Chlorhexidine diacetate (substance)| ,
               1142138002 |Has concentration strength numerator value (attribute)| = #10,
               733725009 |Has concentration strength numerator unit (attribute)| = 258684004 |milligram (qualifier value)| ,
               1142137007 |Has concentration strength denominator value (attribute)| = #1,
               733722007 |Has concentration strength denominator unit (attribute)| = 258682000 |gram (qualifier value)| }

Boolean and string-based concrete values may also be used² . For example, the expression below represents a tablet containing 500 mg of paracetamol with a trade name (or brand name) of "PANADOL"³ .

322236009 |Paracetamol 500mg tablet| : 774158006 |Has product name (attribute)| = "PANADOL"

And the expression below represents an Irbesartan 150 mg tablet that is eligible for reimbursement through the national benefit scheme (of the given country)⁴ .

318969005 |Irbesartan 150 mg oral tablet| : 859999999102 |is in national benefit scheme| = TRUE

Footnotes
Ref	Notes
1	Boolean values are not permitted in the SNOMED CT International edition.
2	Boolean and string-based concrete values should be used with caution. Care must be taken to only use these in situations in which the clinical meaning cannot be adequately defined using a concept value.
3	Concrete values of type string are case sensitive and compared using the Unicode Collation Algorithm (http://www.unicode.org/reports/tr10/).
4	The concept 859999999102 \| is in national benefit scheme \| is a fictitious attribute used here to illustrate boolean values.

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6.6 Expressions With Concrete Values