Background: The aim of the study was to assess the particle size stability of six parenteral nutrition regimens, fitted to various pathologies, and used by the University Hospital of Limoges. The mixtures contained glucose (30 or 50%), amino acids (Hyperamine®25), and either long-chain triglycerides (20% Intralipide®) or a combination of medium and long-chain triglycerides (20% Médialipide®). The regimens were not supplemented.