This document summarizes research on determining exposure to the plasticizer bis(2-propylheptyl)phthalate (DPHP) in the general population. Researchers developed analytical methods to measure DPHP metabolite levels in human urine using GC-MS and LC-MS/MS. A human elimination study found the main metabolites were excreted within 48 hours, with 24% of the dose detected. Further studies detected DPHP metabolites in some general population urine samples at low levels, showing evidence of widespread exposure.