@type t() :: %HL7v2.Segment.OM4{
  additive: term(),
  container_description: term(),
  container_units: term(),
  container_volume: term(),
  derived_specimen: term(),
  extra_fields: term(),
  minimum_collection_volume: term(),
  normal_collection_volume: term(),
  preparation: term(),
  sequence_number: term(),
  special_handling_requirements: term(),
  specimen: term(),
  specimen_priorities: term(),
  specimen_requirements: term(),
  specimen_retention_time: term()
}