Honestly ? i would test it once unused ,then I would re amend to then grow with it THEN have it re tested if it proves better.thats what I would do but if your building a referance point then rock on man!Just gonna take a little longer but well worth it bro. HEY btw,I got a cpl pals down near me that will most likely be going to the next DC event,and NOW I finally have someone to go with ,so I may see you at the next one mang LOL but yeah thats what Id do . there are a few issues with testing that I have seen. there is a baseline zero but to what end do tjhey test? for veggies and an overall generally feeding and healthy soil.so wehat they'll most likely miss if your interested just yet is the aggressive growth in vegetative and early flower aggression in fullness and density. i typically used to see in other states they would test and it would be fine but they would miss fine points in the aggression or powerband phase LOL but either way its a good thing man.