Glossary

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Laparoscopy

Visualization of the ovaries and the exterior of the Fallopian tubes and uterus by means of the inserting a surgical instrument through a small incision below the naval; one or two other punctures may be made through which additional instruments can be inserted and manipulated.

Laparotomy

Open abdominal surgery done through a large incision.

Leuprolide Acetate

A GnRHa hormone used as a daily injection in ART protocols to help control the stimulation of the ovaries. Also used in a depot form (monthly or more intervals) to create a state of "medical menopause" for many gynecologic conditions, especially in the treatment of chronic pelvic pain, endometriosis, and the shrinkage of fibroid tumors.

Luteal Phase Defect

A shorter than normal luteal phase described as suboptimal production of progesterone or a lag in endometrial development.

Luteal Phase Protocol

A LH-RH (GnRH) agonist is administered in the luteal phase of the prior cycle to cause pituitary down-regulation. The exogenous gonadotropins administered are the only stimulation given to cause follicles to develop. This protocol does not utilize the "flare" potential of a LH-RH agonist.

Luteal Phase

The second half of the menstrual cycle after ovulation when the corpus luteum secretes large amounts of progesterone; receptivity of the endometrium to implantation of a fertilized egg depends on progesterone produced in the luteal phase.

Luteinizing Hormone

The hormone that normally triggers ovulation and stimulates the corpus luteum to secrete progesterone. It is produced and released by the pituitary gland. In the male, it stimulates testosterone production.