The Laboratory Order Filler actor represents the information system that receives and processes orders for laboratory testing.  The Laboratory Order Filler actor is a simplification of the Order Filler in the Laboratory Testing Workflow (LTW) profile of the IHE Laboratory Technical Framework.  It supports the same ordering transactions as found in the LTW profile, but has one optional transaction.  The Laboratory Order Filler implementing the Content Exchange option also supports the direct exchange of laboratory reports via the PCC-0 Exchange Content transaction using the content specified in XD-LAB profile.