Basically, it means a defect in the growth and maturation of the egg. This again can range from the total absence of eggs (a genetic disorder) to subtle upsets at genetic levels. As the entire process of the ovulation is under the control of the brain and the pituitary gland, disorders of these areas can cause anovulation. The diagnosis of ovulation can be done by many ways of which the serial transvaginal ultrasound gives an accurate picture. The serum progesterone test in the second half of the cycle can also aid in the diagnosis of ovulation. The estimation of the hormones FSH and LH within 5 days of menses can help in finding the type of anovulation.