My son is PS or at least we thought he was. His GI wants him to do another Fecal Fat Elastase Test this week and I can't remember how long we can keep the "sample" before taking it in to the lab. Has anyone had this test done lately? I can call the clinic tomorrow, but I actually want to use the poo from tonight, but not take it in until Tuesday because I am going to be swamped at work tomorrow and I can't run it down there tomorrow (and who knows if there will be another poo tomorrow or not). Plus I don't want to waste this special container on tonight's poo if I will need it later in the week. Anyone know the answer?