In Ontario, a heel prick is used to take a few drops of blood from each baby shortly after birth. The blood is tested for more than 25 treatable diseases, including guanidinoacetate methyltransferase (GAMT) deficiency.
A screen positive result means that more tests are needed to know whether or not a baby has GAMT deficiency. It does not mean that a baby has GAMT deficiency. Babies identified at a young age through screening can be treated early to help prevent health problems.