Expression Constraint Language

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The following expression constraint is satisfied only by amoxicillin tablets, whose strength is oral medicinal products, which contain amoxicillin and have a presentation strength greater than or equal to 200 mg

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.

250 mg.

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Scg expression
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	< 27658006 |Amoxicillin<763158003 |Medicinal product (product)|:
		411116001 |Has manufactured dose form (attribute)| = << 385055001385268001 |TabletOral dose form (dose form)|,
	{	{<< 179999999100127489000 |Has basisactive ofingredient strength(attribute)| = (<< 219999999102372687004 |Amoxicillin only(substance)|:,
 			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| >= #200#250, 199999999101
		732945000 |Has presentation strength numerator unit (attribute)| = 258684004 |mg|)}milligram (qualifier value)|}

Please note that, as per SNOMED CT Compositional Grammar, integer and decimal values are preceded by a hash character (e.g. "#500"), while string values are surrounded by double quotes (e.g. "PANADOL").

To find those capsules oral amoxicillin products that have a strength between 500 250 and 800 mg (inclusive), the following expression constraint may be used:

Scg expression
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	< 27658006 |Amoxicillin<763158003 |Medicinal product (product)|:
		411116001 |Has manufactured dose form (attribute)| = << 385055001385268001 |TabletOral dose form (dose form)|,
	{	{<< 179999999100127489000 |Has basisactive ofingredient strength(attribute)| = (<< 219999999102372687004 |Amoxicillin only(substance)|:,
 			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| >= #500#250, 
			1899999991031142135004 |Has presentation strength magnitude numerator value (attribute)| <= #800, 
			199999999101732945000 |Has presentation strength numerator unit (attribute)| = 258684004 |mg|)}milligram (qualifier value)|}

Concrete values of type string and boolean may also be included in an expression constraint, and compared using an 'equal to' (i.e. "=") or 'not equal to' (i.e. "!=") operator. The following expression constraint is satisfied only by products with a trade name equal to "PANADOL"

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