Zinc oxide is the metal zinc that has been oxidized. The chemical formula is ZnO, 1 zinc atom and 1 oxygen atom held together by an ionic bond. Zinc oxide does occur in nature as the mineral zincite, but it is quite rare and commercially unavailable.
I have done a few stool samples in my time and have always just stored them in the fridge, until the next day to take them into the docs. Good luck hun I hope they get it sorted.
To help stop bacteria from growing, remember: 1  when the label says 'keep refrigerated', make sure you do keep the food in the fridge. If the food isn't labelled with any storage instructions and it's a type of food that goes off quickly, you should put it in the fridge and eat it within two days.