The best method of assessment of female feility that allows accurate prediction of ovulation is the measurement of urinary LH surge (Hormonal Test). Ref: Clinical Gynaecological Endocrinology and Infeility By Speroff, 7th Edition, Page 1036; Textbook of Gynecology By DC Dutta, 4th Edition, Page 106 221; Management of Common Problems in Obstetrics and Gynecology By T. Murphy Goodwin, Main 4. N. Montoro, Laila Muderspach, Subir Roy, 5th Edition, Page 430