1. Progesterone level at oocyte retrieval predicts in vitro fertilization success in a short- antagonist protocol: a prospective cohort study 
Shweta Nayak, M.D., Melanie E. Ochalski, M.D., Bo Fu, Ph.D., Kathryn-Mary Wakim, B.S., Tian Jao Chu, Ph.D., Xinxin Dong, Ph.D., Anthony N. Wakim, M.D. 
Fertility and Sterility 
Volume 101, Issue 3, Pages e1 (March 2014)
DOI: /j.fertnstert
Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
P levels on day of oocyte retrieval are inversely associated with pregnancy rates. As P levels increased, pregnancy rates decreased. There appears to be a steeper decline in pregnancy rates once the P levels were >12 ng/mL, suggesting that this may be a clinically important level beyond which pregnancy is less likely.
Fertility and Sterility  , e1DOI: ( /j.fertnstert )
Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions