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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").
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. Attributes for which an identifier has not been assigned have been shown with an identifier of '111115'.

. 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 represented using a numeric value. The numeric value is indicated in the expression by the preceding '#' symbol (e.g. #500).
27658006 |amoxicillin |:
411116001 |has dose form| = 385049006 |capsule|,
{ 127489000|has active ingredient| = 372687004 |amoxicillin|,
111115|has basis of strength| = (111115 |amoxicillin only|:
111115|strength magnitude| = #500, 111115|strength unit| = 258684004 |mg|)}
The expression below represents an oral solution that contains 0.083 % albuterol.
91143003 |albuterol |:
411116001 |has dose form| = 385023001 |oral solution|,
{127489000|has active ingredient| = 372897005 |albuterol|,
111115|has basis of strength| = (111115 |albuterol only|:
111115|strength magnitude | = #0.083, 111115|strength unit| = 118582008 |%|)}
String-based concrete values may also be used. 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/).

.
322236009 |paracetamol 500mg tablet|: 111115|trade name| = "PANADOL"
Please note that 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 defined using a concept value.

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