Prostaglandin E₂ (PGE₂) competitive Biotrak system enzymeimmunoassay system from Cytiva is specifically designed for research purposes. RPN222 includes protocols using novel lysis reagents in order to facilitate simple and rapid extraction of PGE2 from cell cultures and plasma samples. These components obviate the need for removal of extracting reagents prior to measurement, ensuring PGE2 is directly available for subsequent analysis. With the method for measurement of PGE2 in plasma, complex, time-consuming sample preparation procedures are avoided. Each pack of RPN222 contains sufficient material for 96 wells. This allows the construction of one standard curve and the measurement of 37 unknowns in duplicate. Each pack of RPN22210 contains sufficient material for 960 wells. This allows for the construction of one standard curve and the measurement of 37 unknowns in duplicate per plate.