Description:2,952 plasma samples collected from the Multiethnic Cohort (MEC) were provided by the PI (Veronica Setiawan, PhD) and analyzed using liquid chromatography with high-resolution mass spectrometry (LC-HRMS) using a hybrid targeted and untargeted method that provides quantitation of known poly- and per-fluoroalkyl substances (PFAS), as well as untargeted detection of small molecules. Results were reported in terms of untargeted mass spectral signals (Level 5), identified small molecules (Level 1), and computational annotations (Level 3 or 4) according to the MSI Annotation Schemes.