code: def get_sampletypes(self):
          
          query = {
              "portal_type": "SampleType",
              "sort_on": "sortable_title",
              "sort_order": "ascending",
              "is_active": True,
          }
          results = api.search(query, "bika_setup_catalog")
          return map(api.get_object, results)
docs: Returns the available SampleTypes of the system