What is leucovorin Leucovorin is a form of folic acid. Folic acid helps your body produce and maintain new cells, and also helps prevent changes

What is leukopenia Leukopenia means a low white blood cell count, which is a decrease in disease-fighting white blood cells (leukocytes) in your blood (<4,000

What is lightheadedness Lightheadedness is a feeling that you are about to faint or "pass out." You may sometimes feel nauseated or vomit when you are

What is levothyroxine Levothyroxine (a thyroid hormone) or levothyroxine sodium, is a thyroid medicine that replaces a hormone normally produced by your thyroid gland to regulate

What is Kartagener syndrome Kartagener syndrome is a type of primary ciliary dyskinesia that is characterized by triad of chronic sinusitis, bronchiectasis, and situs inversus totalis

What is ketonuria Ketonuria occurs when high levels of ketone bodies (acetone, acetoacetate, and beta-hydroxybutyrate) which occur when fatty acids are broken down for energy

What is Lesch Nyhan syndrome Lesch-Nyhan syndrome is a rare, inherited disorder characterized by neurological and behavioral abnormalities and the overproduction of uric acid in

What is lethargy Lethargy is another word for fatigue, which is a feeling of weariness, tiredness, exhaustion or lack of energy. Lethargy is different from drowsiness.

What is lentigo Lentigo is a pigmented flat or slightly raised lesion with a clearly defined edge. Unlike an ephelis (freckle), lentigo does not fade in

What is laparotomy Laparotomy is a major surgical procedure that involves cutting into the abdomen to gain access to the peritoneal cavity ((Rajaretnam N, Burns