Is there an API to get the values from a function that uses a unit of measure?

We are working on the process to generate item descriptions automatically in PIM. We are using a pl/sql function that should concatenate all of the attributes to generate the description.  Our code seems to be working except we are having an issue with the attributes that have a unit of measure. Does anyone have any sample code that would capture the UOM information or is there an API that we should be calling to get the information we need to generate the description?