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. 2012 Apr 24;29(7):609–614. doi: 10.1007/s10815-012-9774-2

Table 2.

Discrimination between clinical and failed pregnancies using serum hhCG for blastocyst transfers

Day post ET Clinical Chemical Sensitivity Specificity
6 day hhCG > = 300 pg/ml 12/13 0/6 100 % 92 %
12 day hhCG> = 6,000 pg/ml 14/16 0/6 100 % 88 %