In today’s natural gas industry, it is imperative that the standards used to calibrate are made to the utmost quality. Calibration standards are mixtures of known concentrations of components used to confirm or determine concentrations in samples. Calibration standards are needed for quality assurance/quality control, measurement and balance, quantitative sample analysis, and custody transfer. Preparation, blending, and final analysis are all crucial factors which will determine the integrity of the calibration standard. Several guidelines, such as ISO, GPA, and API must be followed in order to produce a calibration standard that is accurate and consistent.