I have an appt to take my 9 month old ds3 to the GP tomorrow and know they will want a stool sample. I already have the container and he has just dirtied a nappy. If there is anything other than water to collect, should I collect in now incase he he doesn't oblige in the morning (unlikely)? Would it keep until tomorrow, or is freshest best. I know samples are collected from the surgery at 10.30am and his appt is 8.40am. I need to know if I shold collect this stool or wash it (he's in cloth)