Meriwhen, ASN, BSN, MSN, RN 4 Articles; 7,907 Posts Specializes in Psych ICU, addictions. Nov 8, 2016 Non-negative means one of three things:Positive: you popped positive. May be a false positive, or a bona-fide positive.Inconclusive: can't be proven positive or negative either way. Because of that, it's definitely not negative (i.e., non-negative)Invalid: sample was dilute, compromised, tampered with, or otherwise unable to be relied upon. This could be accidentally or intentionally. Again, not definitely negative...Whether your program automatically considers Inclusive or Invalid a Positive, I don't know. Usually they will request a retest...unless you have a few too many Invalid tests under your belt for their liking (e.g., every other urine sample comes back as being dilute). Then they may not be as forgiving.I'm glad things worked out for you.