The amount of a polypeptide N-acetylgalactosaminyltransferase 10 (human) when measured in blood. The trait is Ontology of Biological Attributes term OBA_2052181 (amount of polypeptide N-acetylgalactosaminyltransferase 10 (human) in blood). Also known as: blood polypeptide N-acetylgalactosaminyltransferase 10 (human) amount.