LC-MS/MS quantification of parathyroid hormone fragment 1-34 in human plasma

It was desired to use contemporary knowledge and technology to develop a highly selective and reliable LC-MS/MS method for teriparatide in human plasma to begin to supplant existing ELISA methodologies. The method was developed using SPE of intact teriparatide and the internal standard rat analogue parathyroid hormone fragment 1-34 from human plasma, and UPLC-MS/MS analysis. Inter- and intra-batch accuracy and precision ranged from 97.5 to 109%, and 1.78 to 12.4%, respectively. Mean analyte extraction recoveries of 80% were attained. All relevant acceptance criteria were met in a procedure akin to method validation without the stability aspects, and with a basis of excellent signal stability all performance aspects of the method were unassailable.