how long can pee be stored
Urine should be stored in a fridge for no more than 24 hours for use in a lab analysis. Source: Britain's National Health Service (NHS): I cant post link :/ but Google NHS urine sample and you can see my source.
Metabolites 2013, 3 257 Thus, we would recommend that, if freezing samples in lN 2 is not feasible, urine samples should be frozen at −20 °C and transferred to lower storage temperatures (−80 °C, lN 2) within one week. If this is not possible, all samples of a study should be frozen in the same way.etabolites 2013, 3 244 variations in CO 2 concentrations introduced by the freezing procedure. Thus, we recommend that urine samples should be frozen at −20 °C and transferred to lower storage temperatures within one week and that freezing procedures should be part of the publication protocol.