U.S. FDA adopted 3 nanotechnology standards as part of update to List of Recognized Standards. Adopted standards were ISO/TS 14101, Surface characterization of gold nanoparticles for nanomaterial specific toxicity screening: FT-IR method; ASTM E2490, Standard Guide for Measurement of Particle Size Distribution of Nanomaterials in Suspension by Photon Correlation Spectroscopy (PCS); and ASTM E2535, Standard Guide for Handling Unbound Engineered Nanoscale Particles in Occupational Settings.