The part of the SNOMED CT expression specifying the context of the focus concept.

Family history of asthma can be represented by an expression in which the   195967001 | Asthma| is nested within a context wrapper indicating family history.
281666001 |Family history of disorder (situation)| :                         ⬅︎ Context wrapper
      { 246090004 |Associated finding| = 195967001 |asthma|        ⬅︎ Focus concept
      }
Addition information can be added in the context wrapper to specify the family member affected by asthma.
281666001 |Family history of disorder (situation)| :                                   ⬅︎ Context wrapper
      { 408732007 |Subject relationship context| = 72705000 |Mother| ,     ⬅︎      ...
         246090004 |Associated finding| = 195967001 |asthma|                  ⬅︎ Focus concept
        }

Related Links

context wrapper