My name is Barbra Fobi an ISMP fellow. I am currently working on the question “what is the safest way to express doses less than 1 mg (e.g. 0.057 mg or 57 mcg)?” In addition, is there a safer dose expression when crossing a metric threshold (i.e. 1000 mcg or 1 mg)?” Presently, ISMP’s Draft Guidelines for Safe Communication of Electronic Medication Information #9 addresses trailing zeros, leading zeros (e.g. 0.3 instead of .3) and commas but not these specific concerns. I would be grateful for your expertise and guidance on where to search for data to use in answering this question as well as learning how you approach this in your own organization. Please kindly specify if your practice setting is pediatric, adult or both. Thank you!