Fresh samples are best! Urine samples should be brought to us within the hour of collection. If it is warm out, please use an icepack for transport. We need about 1 tablespoon or more of liquid urine (no clumping litter samples, please!). Fecal samples should be brought in within 24 hours. We need about 1 tablespoon of sample. Use a clean container with a tight lid (or ziplock bag for fecal samples). If you are having trouble collecting the sample, give us a call and we can help!