From: Ectopic pregnancy: when is expectant management safe?
Initial beta-hCG titer
Group I
Group IIa
Group IIb
Total
Immediate intervention
Unsuccessful expectant management
Successful expectant management
<2,000
1
88
92
181
2,000–2,500
0
10
5
15
>2,500
32
2
66
33
130
99
262