serum progesterone in normal pregnancy and missed miscarriage

1) value serum progesterone in normal pregnancy and missed miscarriage

-Hahlin et al: 99% of viable intrauterine pregnancy serum progesterone >30nmol/L, 75% of ectopic pregnancy and spontaneous abortion <30nmol/L

-medscape : serum progesterone level below 20nmol/L shown to have a positive predictive value greater than 95% of predicting pregnancy failure; levels >25nmol/L (likely to indicate) and >60nmol/L (strongly associated) with pregnancies subsequently demonstrated to be viable