Could someone with a medical background answer this please?

This is a common standard 7 panel ay or drug screen..The values you see don,t represent detection levels" we can detect down to nill.. These are cuttoff limits.. IE if one has 51 MCG/L of THC then that is a positive.. If one test @ 49 MCG/l of THC then teeeeechnically that is a negative and I will call it negative but I still know ya been using..Hope this helps