Blood work, Leukocyte Esterase negative but abnormal?

Patient: I had lab work done. Everything was normal….except:Test name: LEUKOCYTE ESTERASE, Result: (asterisk) TRACE, Flag: ABNORMAL, Reference Range: NEGATIVEI realize that the reference range is negative but should I be concerned that it’s flagged “abnormal” and has “trace”, whatever that means, as the result??