Gonorrhea: A sexually transmitted disease that causes inflammation of the genital
mucous membranes. Infection is caused by Neisseria gonorrhea.
Graft-versus-Host Disease (GVD): A disorder in which the grafted tissue
(lymphocytes) attacks the host tissue.
HBcAg: Hepatitis B core Antigen, referring to the nucleocapsid of the virion.
HBeAg: Hepatitis B envelope Antigen, DNA polymerase of the nucleus of the virion.
HBsAg: Hepatitis B surface Antigen.
Hematocrit: The percentage of red cells in whole blood.
Hematoma: A swelling or mass of blood confined to an organ, tissue, or space and
caused by a break in a blood vessel (may be due to phlebotomy).
Hemoglobin: The iron containing pigment of the red blood cells. Its function is to carry
O2 from the lungs to the tissues.
Hemolytic Disease of the Newborn (HDN): A disease characterized by anemia,
jaundice, enlargement of the liver and spleen, and generalized edema (hydrops fetalis).
Due to maternal IgG antibodies that cross the placenta and attack fetal red cells when
there is a feto-maternal blood group incompatibility. Usually caused by ABO or Rh
Hemophilia: An hereditary blood disease characterized by greatly prolonged
coagulation times. There are 3 types, which are due to deficiencies of Factor VIII, IX,
Hemorrhage: Abnormal internal
or external bleeding.
Hepatitis: Inflammation of the liver.
Hepatitis B Immune Globulin (HBIG): An immune serum given to individuals exposed
to the hepatitis B serum (NOT given prophylactically).
HIV: Human Immunodeficiency Virus. The causative agent of AIDS.
HLA: Human Leukocyte Antigen.
HTLV: Human T-Cell Lymphotropic Virus.
HTR: Hemolytic Transfusion Reaction.