A method for measuring a glomerular filtration rate of a mammalian subject comprises a source of reporter and marker fluorescent molecules. A maintenance service center is connected to an exchange network and by a backup control request, that includes the portable telephone number and a code number from the person who lost the portable telephone set, dialing is done from the maintenance service center to the lost portable telephone set. A terminal array extends between the wire end and the mating end of the housing. 95% or more is prepared, and is hydrolyzed by adding a small amount of acids to the solution.