Compositional Grammar

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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) and , strings (e.g. "PANADOL"), and booleans (e.g. TRUE

Footnote Macro

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

.

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 examples are based on a hypothetical drug concept model, and is not intended to reflect any specific drug model.

. 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 containing only amoxicillin in oral

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dose form (medicinal product form)| :
        411116001 |Has manufactured dose form (attribute)| = 421026006 |Conventional release oral tablet (dose form)|, 
        763032000 |Has unit of presentation (attribute)| =

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 732936001 |Tablet (unit of presentation)|, 
        1142139005 |Count of base of active ingredient (attribute)| = #1, 
        766939001 |Plays role (attribute)| = 787994008 |Antibacterial therapeutic role (role)|
            { 762949000

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|Has precise active ingredient (attribute)| = 372687004 |Amoxicillin (substance)|, 
              732943007

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|Has basis of strength substance (attribute)| = 372687004

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|Amoxicillin

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(substance)|,

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      1142135004 |Has presentation strength

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 numerator value (attribute)| = #500,

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              732945000 |Has presentation strength numerator unit (attribute)| = 258684004

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 |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 % albuterola medicinal product that contains precisely chlorhexidine diacetate 10 milligrams per gram conventional release cutaneous powder.

Scg expression
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   778726003

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|Product containing only chlorhexidine in cutaneous dose form (medicinal product form)| :
        411116001 |Has manufactured dose form (attribute)| = 385112003

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|Conventional release cutaneous powder (dose form)|, 
        1142139005 |Count of

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base of active ingredient (attribute)| = #1
            { 762949000 |Has precise active ingredient (attribute)| =

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96317008 |Chlorhexidine diacetate (substance)|, 
              732943007

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|Has basis of strength substance (attribute)| = 96317008 |Chlorhexidine diacetate (substance)|, 
              1142138002 |Has concentration strength numerator value (attribute)| = #10,

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           733725009 |Has concentration strength numerator unit (attribute)| = 258684004 |milligram (qualifier value)|, 
              1142137007

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|Has concentration strength denominator

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value (attribute)| =

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#1,

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              733722007 |Has concentration strength denominator unit (attribute)| = 258682000 |gram (qualifier value)| }

Boolean and string118582008|%|)}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"

Footnote Macro

Concrete values of type string are case sensitive and compared using the Unicode Collation Algorithm (http://www.unicode.org/reports/tr10/).

.

Scg expression
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   322236009|Paracetamol 500mg tablet|: 774158006

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|Has

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product name (attribute)| = "PANADOL"

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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.

.

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


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