In the article titled “Comparative study of serum progesterone levels at the time of human chorionic gonadotropin trigger and ovum pickup in predicting outcome in fresh in vitro fertilization cycles”, published on pages 234-239, Issue 3, Volume 12 in Journal of Human Reproductive Sciences [1], the sentence “The primary role of progesterone produced by corpus luteum is the preparation of estrogen primed endometrium for implantation of an embryo and its maintenance thereof till initial weeks of pregnancy.” was incorrectly written as “The primary role of progesterone produced by corpus luteum is the preparation of estrogen primed endometrium for implantation of an embryo and its maintenance. There of till the initial weeks of pregnancy.” on page 234, 44 line, under “Introduction” paragraph.The correct statement should be read as “The primary role of progesterone produced by corpus luteum is the preparation of estrogen primed endometrium for implantation of an embryo and its maintenance thereof till initial weeks of pregnancy.”Also, the term “exists” was misspelled as “exits” on page 236, 12tht line, under “ Statistical analysis” paragraph.The correct statement should be read as “We have considered parametric tests because of the large sample size, different spread/dispersion of compared groups, and to give better statistical power to study if there is a true significance effect that exists.”