The amount of a nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) when measured in blood. The trait is amount of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) in blood (Ontology of Biological Attributes identifier OBA_2052539). Also known as: blood nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) amount.