Sigma-Aldrich is committed to providing materials that meet our customers’ requirements. This commitment is demonstrated by the establishment of programs to monitor, preserve and protect the quality of our products. We document the Quality Release Date, that is, the point in time when analytical data has been reviewed as confirming compliance with product description, specification and lot uniformity, for all products. For those materials where shelf life information is a requirement, expiration and retest periods are available at the batch level. IVD products that are expiration dated will have the expiration date found on the product labels. When dating is indicated by month and year only and no specific date is otherwise stated on the label or elsewhere, the product is expected to meet specifications until the last day of the month.