Measurement of Hydro-EVE and 6:2 FTS in Blood from Wilmington, North Carolina, Residents, 2017–2018

Our original analysis of PFEAs in Wilmington serum samples was conducted by liquid chromatography coupled to highresolution mass spectrometry.4 At that time, authentic analytical standards for most PFEAs detected in the Cape Fear River were not commercially available. However, in 2022, we acquired authentic analytical standards for Hydro-EVE and 6:2 FTS and obtained measurements for a subset of GenX Exposure Study participants. This letter reports the results of the measurements for Hydro-EVE and 6:2 FTS in blood serum samples from Wilmington residents from 2017 and 2018.