Can I truncate unwanted fields from hl7 segments?

Question

I am getting more fields in segments than I what I need for the destination. How can I remove unwanted fields?

Answer 1

See the commented code below:

function removeExtraHl7Fields(segmentToProcess, numberOfFieldsToKeep) {
   // set the numberOfFieldsToKeep to a number for the for loop
   numberOfFieldsToKeep = Number(numberOfFieldsToKeep);
   
   // Get a count of the number of the segments to process in the message
   var segmentCount = message.getCount(segmentToProcess);
   
   //Loop through each segment that exists
   for (var segment = 1; segment <= segmentCount; segment++) {
      //Get the current segment so we have the data
      var oldSegment = qie.parseHL7String(message.getNode(segmentToProcess, segment));
      
      //set the segement in the mssage to blank so we can rebuild
      message.setNode(segmentToProcess, segmentToProcess + '|', segment);
      
      //Handle if this is an MSH segment
      var field = 1;
      if (StringUtils.equalsIgnoreCase(segmentToProcess, 'MSH')) {
         field = 2;
      }
      
      //Loop through each field and put back the number of fields requested
      for (field; field <= numberOfFieldsToKeep; field++) {
         message.setNode(segmentToProcess + '-' + field, oldSegment.getNode(segmentToProcess + '-' + field), segment);
      }
   }
}

//Sample calls to the above function
removeExtraHl7Fields('MSH', 4);
removeExtraHl7Fields('PV1', '2');
removeExtraHl7Fields('PID', '8');