This assay has high sensitivity and excellent specificity for detection of 8-Epi Prostaglandin F2 Alpha (8-epi-PGF2a, 8-iso-PGF2alpha, 8-iso-PGF2a). No significant cross-reactivity or interference between 8-Epi Prostaglandin F2 Alpha (8-epi-PGF2a, 8-iso-PGF2alpha, 8-iso-PGF2a) and analogues was observed.