Receiver operator characteristics and diagnostic value of progesterone and CA-125 in the prediction of ectopic and abortive intrauterine gestations

ObjectiveThe study was designed to investigate the predictive value of progesterone and CA-125 in the diagnosis of ectopic pregnancy (EP) and inevitable miscarriage.MethodsForty women with EP, 20 with intrauterine (IU) abortive gestation and 20 regular pregnant women (controls) were studied. IU abortive and EP were confirmed and treated by surgery. Serum progesterone and CA-125 levels were measured at the time of presentation and 24 h after surgery.ResultsWomen with EP had significantly lower progesterone concentrations, compared to both women with IU abortive pregnancy and controls. Women with IU abortion had significantly higher CA-125 levels, compared to the other two groups. When using a progesterone concentration of less than 10.75 ng/ml as a cut-point for the diagnosis of EP, sensitivity, specificity, positive and negative predictive values were 85%. When using CA-125 concentration of more than 41.9 U/ml as a threshold for the diagnosis of IU abortive pregnancy, sensitivity was 80%, specificity 87%, the positive predictive value was 66% and the negative predictive value 93%.ConclusionThe measurement of progesterone and CA-125 levels is useful in discriminating ectopic and intrauterine abortive from normal gestations.