1. The serum follicle-stimulating hormone-to-luteinizing hormone ratio at the start of stimulation with gonadotropins after pituitary down-regulation is inversely correlated with a mature oocyte yield and can predict “low responders” 
Jason Yen-Ping Ho, M.D., Hwa-Fen Guu, M.Sc., Yu-Chiao Yi, M.D., Ming-Jer Chen, M.D., M.Sc., Esther Shih-Chu Ho, M.D. 
Fertility and Sterility 
Volume 83, Issue 4, Pages (April 2005)
DOI: /j.fertnstert
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

2. FIGURE 1
Correlation between the number of mature oocytes retrieved and serum FSH and LH levels and the FSH-to-LH ratio measured at the start of stimulation with gonadotropin.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

3. FIGURE 2
Receiver operating characteristic curves of the area under the curve (AUC-ROC) for serum FSH and LH levels and the FSH-to-LH ratio measured at the start of stimulation with gonadotropin as predictors of poor responders. The inflection point corresponds to an FSH-to-LH ratio of 3.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions