After reconstituting, the contents can be stored at 2-8°C for up to 4 hours before using according to the instrument manufacturer’s instructions and stored in one of the following ways: at 2-8°C for up to 4 hours; or at -20°C or colder for up to 2 months. When stored at -20°C or colder, the contents can be thawed and re-frozen up to 4 additional times and should be used within 1 hour after thawing.