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Table 5 Thresholds of serum β-hCG level for prediction of clinical pregnancies and live births

From: Possibility of live birth in patients with low serum β-hCG 14 days after blastocyst transfer

Pregnancy outcomes Clinical pregnancy Live birth Clinical pregnancy Live birth
  Threshold of β-hCG level (mIU/ml) Threshold of β-hCG fold increase over 48 h
  58.8 108.6 1.4 1.9
AUC 0.752 0.649 0.899 0.808
95% CI of AUC 0.680–0.823 0.583–0.715 0.801–0.996 0.724–0.891
Sensitivity % 95.0 93.1 90.3 88.5
Specificity % 53.5 37.0 77.8 64.5
PPVa % 85.8 25.2 97.4 63.6
NPVb % 73.3 95.9 33.3 92.3
  1. a PPV positive predicted value; b NPV negative predicted value