Dictionary

factor assay: A test used to find out how much factor VIII or IX that a person has in their body.

Factor V Leiden mutation: A mutation of certain genes that is an inherited trait. Some people with this mutation end up developing thrombophilia, which is a blood clotting disorder.

Glanzmann's thrombasthenia: A rare blood disorder in which the blood lacks a protein that aids in the production of clots.

hemarthrosis: Bleeding that occurs in joint spaces and is common in patients with hemophilia. It can cause long term disability.

hematologist: A doctor who specializes in blood disorders.

hemophilia A: This type of hemophilia is known as classic hemophilia, and also Factor VIII Deficiency. The people who have this disease either have a reduced amount or lack altogether a certain protein that helps with blood clotting. This hemophilia is usually an inherited disorder; however some people do develop hemophilia with no family history. This is the most common form of hemophilia.

hemophilia B: This type of hemophilia is known as Christmas disease, and also as Factor IX Deficiency. People with this form of hemophilia either have a reduced amount or lack altogether a certain protein that helps with blood clotting. It is an inherited disorder, and is the second most common form of hemophilia.

hemorrhage: Bleeding, the loss of blood.

hemorrhagic telangiectasia: A blood disorder in which the blood vessels are extremely fragile and can result in prolonged bleeding.

hemostasis: The process in which the body stops bleeding.

Henoch-Schonlein purpura: A disease that is characterized by an over-sensitized vasculitis and an inflammatory response in the blood vessels. People with this disease experience joint pain, purple spots on the skin, and kidney disorders. It is caused by a response of the immune system that is abnormal.

hypercoagulation: Excessive blood clotting.