From: Luteal blood flow in patients undergoing GnRH agonist long protocol
No. of CL
CL-RI
No. of CL with CL-RI < 0.51
Control
17
0.552 ± 0.013
3/17
HCG
21
0.457 ± 0.011a
18/21b
Vitamin E
18
0.448 ± 0.012a
16/18b