Pre-mixed amino acid and dextrose solutions used for parenteral nutrition had additions made to them at a ward level by medical officers. Samples of the solutions of the study group and a control group were taken at six hours and at the end of the infusion time and were analysed microbiologically for growth of microorganisms. No organism was isolated from either group. We conclude that making additions to pre-mixed amino acid/dextrose solutions at the ward level does not constitute a microbiological hazard for the patient.