Urine Calcium 'normal range' was done with praticipants not taking calcium supplements. So if you are trying to establish what you 'normal range' is, this cannot be done while taking supplementation.
If you know your normal range and there is some reason that urine cal is being evaluted while on supplemneation - then that is needed for your case.

My urine cal was high ( while on calcium supplmentation and due to High Vit D). To evaluate what was normal for me I was off calcium and off Vit D. When VIt D normalized, i continued to retest 24 urnice cal off cal supplementation to make sure my range fell into normal, HOpe this makes sense. Urine cal normal range cannot be estblished while on cal supplementation - if that is what is being checked. Perhaps are there some kindney issues that are follwoed while on supplementation to make sure excretion is not too high or toxic - but that is a special evalution.