A severity observation (templateId 2.16.840.1.113883.10.20.1.55) SHALL be represented with Observation. The value for “entryRelationship / typeCode” in a relationship between a reaction observation and severity observation SHALL be “SUBJ” “Has subject” 2.16.840.1.113883.5.1002 ActRelationshipType STATIC. The value for “Observation / classCode” in a severity observation SHALL be “OBS” 2.16.840.1.113883.5.6 ActClass STATIC. The value for “Observation / moodCode” in a severity observation SHALL be “EVN” 2.16.840.1.113883.5.1001 ActMood STATIC. A severity observation SHALL include exactly one Observation / statusCode. The value for “Observation / statusCode” in a severity observation SHALL be “completed” 2.16.840.1.113883.5.14 ActStatus STATIC. A severity observation SHALL contain exactly one Observation / code. The value for “Observation / code” in a severity observation SHALL be “SEV” “Severity observation” 2.16.840.1.113883.5.4 ActCode STATIC. A severity observation SHALL contain exactly one Observation / value.