The amount of a peptidyl-prolyl cis-trans isomerase FKBP1A when measured in blood serum. The trait is Ontology of Biological Attributes term OBA_2041587 (level of peptidyl-prolyl cis-trans isomerase FKBP1A in blood serum). Also known as: blood serum peptidyl-prolyl cis-trans isomerase FKBP1A amount.