I just caught Tigger peeing on our leather ottoman. So, I had a syringe sitting in the refrigerator, and took a sample. Do I put her sample back in the fridge til morning, or leave it out? Another, thing, is I think this syringe has been used w. amoxicillin, but am not 100% sure... I've always been good about rinsing them clean. Anyways, does the urine have to be cold or warm?