As of 12/3/2015, we have deployed this feature to all Practice Fusion practices, now including attaching structured lab results. You can learn how to use this new feature here:
http://knowledgebase.practicefusion.com/knowledgebase/articles/608556Rahul Gor commented
Someone better give you guys credit for being so responsive with updates and improvements to the system. It didn't start out well at all but the new interface is getting much better. Attaching lab results to a referral is very useful.