1 Quantitative Analysis of Dried Bloodspot 17-Hydroxyprogesterone by ACQUITY UPLC-MS/MS for Clinical Research Heather A Brown, 1 Claudia Rossi,2 and Lisa J Calton 1 Waters Corporation, MS Technologies Centre, Manchester, UK 2 Department of Biomedical Science, G. d’Annunzio University Foundation, Pescara, Italy