The amount of a alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase 6 when measured in blood serum. The trait is OBA_2043680 (level of alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase 6 in blood serum). Also known as: blood serum alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase 6 amount.