Our Great Crested Newt eDNA Kits have a shelf life of 3 months. Kits can be stored at ambient temperature after use if couriered on the day of collection. If samples are stored overnight (or longer) before shipping, they should be refrigerated at 2-4°C. Samples can be stored for up to 1 month in the refrigerator before analysis but should not be frozen. We advise that samples are returned to our lab as soon as possible after collection.