•The rate of change in serum hCG levels from two consecutive visits was determined and compared to a minimal rise of 35% in 2 days (99% CI for the rise in hCG in an IUP), ...

The change in serum hCG over time (hCG ratio) and progesterone levels can be used to predict failing PULs. Mathematical models to predict PUL outcome have been developed but need to be tested in ...