I'm interested in knowing how pathology departments that have this system handle add on tests. At mid yorkshire we ask the requestor to do one of the following (we are using ilab Apex v5.6 plus HL7 messaging).
1) If the original form is still on the ward/department, delete the order and start again, making sure that all tests required are selected this time.
2) If the original form has left the department, print out a summary of the original request and hand write the add on tests required.