<prompt> Confirmed case of fluorosis is defined by presence of fluoride in urine more than:1 mgL3 mgL5 mgL7 mgL  <response>: Confirmed case of fluorosis is defined as presence of one or both of the following: High level of fluoride in urine 1mgL Intraosseous membrane calcification in fore arm confirmed by Xray Ref: Health policies and programmes in India, D.K. Taneja 11th edition page: 329 