Time elapsed after the measurement of plasma kisspeptin or serum hCG to the diagnosis of miscarriage.

A, Plasma kisspeptin is significantly lower in pregnancies during miscarriage, regardless of the time elapsed between the blood test and the diagnosis of miscarriage. B, Levels of plasma kisspeptin correlated with time elapsed until diagnosis of miscarriage in asymptomatic singleton pregnancy. C, Serum hCG is lower only in pregnancies during miscarriage if the time elapsed between the blood test and diagnosis of miscarriage is less than 21 days. D, Scatterplot of serum hCG vs time elapsed until the diagnosis of miscarriage during asymptomatic singleton pregnancy. *, P < .05; ***, P < .001.