Figure 1

Passing Bablok plot of creatinine-corrected P4 Cobas and PDG ELISA (top left panel), P4 Architect and PDG ELISA (top right panel), P4 Architect and P4 Cobas (bottom left panel) and Bland Altman Plot of the two P4 assays (bottom right panel). P4: Progesterone, PDG: pregnanediol glucuronide, Cobas: Roche Cobas e411 electrochemiluminescence assay, Architect: Abbott Architect chemiluminescent microparticle immunoassay.