Hematocrit (Hct)

The percentage of red blood cells in the blood

Hematuria

Blood (frank or discrete) in the urine

Hemoccult (Guaiac) Test

A quick visual test that checks for hidden blood in the stool

Human leukocyte antigen test (HLA)

A test used to match blood or bone marrow from a donor to a transfusion or transplant recipient

Immunity (Immune system)

The body's ability to fight infection and disease

Immunosuppression

Weakening of the immune system that causes a lowered ability to fight infection and disease

Immunotherapy

Stimulation of the body's immune system to treat or fight disease through medical treatment