This assay employs the competitive inhibition enzyme immunoassay technique. A monoclonal antibody specific to Parathyroid Hormone (PTH) has been pre-coated onto a microplate. A competitive inhibition reaction is launched between biotin labeled Parathyroid Hormone (PTH) and unlabeled Parathyroid Hormone (PTH) (Standards or samples) with the pre-coated antibody specific to Parathyroid Hormone (PTH). After incubation the unbound conjugate is washed off. Next, avidin conjugated to Horseradish Peroxi