基礎黃體素濃度過高導致懷孕率較低

基礎黃體素濃度(Day 2 progesterone, P4)過高，通常懷孕率較低(<10%)
P4濃度與E2濃度成反比，P4濃度高，E2濃度下降

basal hormonal levels at initiation of stimulation (FSH < 10 IU/liter, LH < 10 IU/liter, E2 < 80 pg/ml, and progesterone (P) < 1.6 ng/ml).

http://humrep.oxfordjournals.org/content/19/7/1525.full.pdf