The median hCG concentration was 126 mIU/mL in viable pregnancies and 31 mIU/mL in non-viable pregnancies ( four times higher ; P < ). The median hCG level in twin pregnancies was almost double that in singleton pregnancies (201 mIU/mL vs. 115 mIU/mL). With detailed statistical analysis (ROC curve) they concluded that an hCG level of 76 mIU/mL was a suitable cut-off point for predicting viable pregnancy with 80% sensitivity and 82% specificity. The positive predictive value for a viable pregnancy at this level was 87% and the negative predictive value was 74%. All biochemical pregnancies were found at hCG levels < 100 mIU/mL.
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