@type t() :: %HL7v2.Segment.OM1{
  address_of_outside_site: term(),
  challenge_information: term(),
  coded_representation_of_method: term(),
  confidentiality_code: term(),
  contraindications_to_observations: term(),
  date_time_stamp_for_any_change_in_definition_for_the_observation: term(),
  description_of_test_methods: term(),
  effective_date_time_of_change: term(),
  extra_fields: term(),
  factors_that_may_affect_the_observation: term(),
  fixed_canned_message: term(),
  identity_of_instrument_used_to_perform_this_study: term(),
  interpretation_of_observations: term(),
  kind_of_quantity_observed: term(),
  modality_of_imaging_measurement: term(),
  nature_of_service_test_observation: term(),
  observation_description: term(),
  observation_producing_department_section: term(),
  observations_required_to_interpret_the_observation: term(),
  orderability: term(),
  other_names: term(),
  other_service_test_observation_ids_for_the_observation: term(),
  outside_site: term(),
  patient_preparation: term(),
  permitted_data_types: term(),
  phone_number_of_outside_site: term(),
  point_versus_interval: term(),
  portable_device_indicator: term(),
  preferred_long_name: term(),
  preferred_report_name: term(),
  preferred_short_name: term(),
  procedure_medication: term(),
  processing_priority: term(),
  processing_time: term(),
  producer_id: term(),
  producers_service_test_observation_id: term(),
  reflex_tests_observations: term(),
  relationship_modifier: term(),
  report_display_order: term(),
  report_subheader: term(),
  reporting_priority: term(),
  rules_that_trigger_reflex_testing: term(),
  sequence_number: term(),
  service_test_observation_performance_schedule: term(),
  specimen_required: term(),
  target_anatomic_site_of_test: term(),
  telephone_number_of_section: term(),
  typical_turn_around_time: term()
}