Neo TSH kit designed specifically to measure TSH concentration in neonatal blood on special filter paper (Guthrie cards) were collected and dried, it is prepared. Using dried blood on filter paper highlights 40-year history. The method for screening newborns for the first time by Robert Guthrie blood phenylalanine was used. Today, with the growing use of dried blood, this innovative technique called it "Guthrie cards" was named. Because the concentration of TSH in hypothyroid children separated from healthy children is more beneficial than T4, so companies are prepared Pyshtaztb Neo TSH assay is favored. This kit TSH concentration to Aymvnvanzymatyk method (ELISA) and small 3 mm on a disk measures the Guthrie card blood.