Conclusion: (18F) FDG produced in PET-CT and Cyclotron Unit of Cho Ray hospital with good quality, stability consistent with the United States Pharmacopeia standards have been administrated for patients in the hospital and may be provided to other hospitals equipped with PET / CT scanner only. Keywords: (18F) FDG, (18F) Fludeoxyglucose, PET radiopharmaceuticals, Quality control.