The amount of a nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 when measured in blood. The trait is Ontology of Biological Attributes identifier OBA_2050781 (level of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 in blood). Also known as: blood nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 amount.