The amount of a peptidyl-prolyl cis-trans isomerase FKBP4 (human) when measured in blood. The trait is amount of peptidyl-prolyl cis-trans isomerase FKBP4 (human) in blood (OBA_2052571, an Ontology of Biological Attributes id). Also known as: blood peptidyl-prolyl cis-trans isomerase FKBP4 (human) amount.