Compositional Grammar

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Note

Please note that concrete values are currently not supported in the SNOMED CT International Release or the Snowstorm terminology server. A technical preview of the SNOMED CT International Edition of SNOMED CT is planned for the first quarter of 2021, which will feature the use of concrete values for numberswith 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. TRUE)

Footnote Macro

Boolean values are not permitted in the SNOMED CT International edition.

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The expression shown below uses both concept values and concrete values to represent a capsule that contains 500 mg of amoxicillin

Footnote Macro

Please note that these example expressions are based on a hypothetical drug concept model, and are not intended to reflect any specific drug model. In these expressions, the SNOMED CT identifiers created with the '9999999' namespace are for example only, and should not be used in a production environment.

. In 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 magnitude is numerator and denominator are represented using a numeric value. The numeric value is 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).

Scg expression
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 778317004 |Product 774586009|Amoxicillincontaining 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)| = 420692007|Oral capsule|,
 732936001 |Tablet (unit of presentation)|, 
        1142139005 |Count of base of active ingredient (attribute)| = #1, 
        766939001 |Plays role (attribute)| = 787994008 |Antibacterial therapeutic role (role)|
            { 762949000 127489000|Has precise active ingredient (attribute)| = 372687004 |Amoxicillin (substance)|, 
              732943007 179999999100|Has basis of strength substance (attribute)| = 372687004 |Amoxicillin (substance)|, 
              1899999991031142135004 |Has presentation strength numerator value (attribute)| = #500, 199999999101|Has 
              732945000 |Has presentation strength numerator unit (attribute)| = 258684004|mg| |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 an oral solution that contains 0.083 % albuterol.a medicinal product that contains precisely chlorhexidine diacetate 10 milligrams per gram conventional release cutaneous powder.

Scg expression
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   778726003 91143003|Albuterol||Product containing only chlorhexidine in cutaneous dose form (medicinal product form)| :
        411116001 |Has manufactured dose form (attribute)| = 385112003 385023001|oral solution|,
|Conventional release cutaneous powder (dose form)|, 
        1142139005 |Count of base of active ingredient (attribute)| = #1
            {127489000 762949000 |Has precise active ingredient (attribute)| = 96317008 372897005|Albuterol|Chlorhexidine diacetate (substance)|, 
              732943007 179999999100|Has basis of strength substance (attribute)| = 372897005|Albuterol96317008 |Chlorhexidine diacetate (substance)|, 
         189999999103     1142138002 |Has concentration strength numerator value (attribute)| = #0.083, 199999999101|Has strength numerator unit| = 118582008|%|}#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 used

Footnote Macro

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.

. For example, the expression below represents a tablet containing 500 mg of paracetamol with a trade name (or brand name) of "PANADOL"

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Scg expression
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   322236009|Paracetamol 500mg tablet|: 774158006 209999999104|Has tradeproduct 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)

Footnote Macro

The concept 859999999102 | is in national benefit scheme | is a fictitious attribute used here to illustrate boolean values.

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Scg expression
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   318969005 |Irbesartan 150 mg oral tablet|: 859999999102 |Isis in national benefit scheme| = TRUE

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 Display Footnotes Macro