<prompt> Which of the following methods for assessment of female infertility during a menstrual cycle can best predict timing of ovulation:BBTFern TestSpinnbarkeit PhenomenonHormonal Study  <response>: Ans. is d, i.e. Hormonal studyRef: Leon Speroff 8thed, pi 161-4; Dutta Gynae 5thed, p228LH SurgeEvaluation of ovulation is an important part of any female fertility investigation. All of the different methods are useful and no one method is necessarily best. When circumstances require accurate prediction of ovulation as in couples having infrequent intercourse or those who require timely insemination, monitoring urinary LH excretion generally is the most cost-effective and appropriate choice - Ref: Leon speroff 7thed, p1036Ovulation predictor kits LH kits are noninvasive and widely available, require relatively little time and effort. Their greatest advantage over other methods is the ability to accurately predict when ovulation will occurLH ovulation predictor kits are probably the most convenient home monitoring methods of predicting ovulation - Ref: Cambridge Guide to Infertility management and Assisted reproduction68Note: Ovulation occurs because of LH surgeOnset of LH surge to ovulation 36 hoursOnset of LH peak to ovulation 12 hoursSerum Progesterone levels It is the simplest method to assess ovulation in a female with regular menstruationTest - Should be performed 1 week after LH surge, i.e. on Day 21 if menstrual cycle is of 28 days.If serum progesterone levels on day 21 are 3ngml, it indicates ovulation has occurred. 