Brian Leber MDCM FRCPC


Blood Type

Human blood is typed according to whether certain markers, called antigens, are present on the surface of red blood cells. The ABO system classifies blood as type A, B, AB, or O based on the presence or absence of the A and B antigens; the Rh system classifies blood as negative or positive based on the presence or…

Blood Transfusions: Should I Bank Blood Before Surgery?

Guides through decision to bank blood before having surgery. Explains how banking blood before surgery can protect from a bad reaction to a blood transfusion. Covers benefits and risks. Includes an interactive tool to help you make your decision.

Acquired Von Willebrand’s Disease

Acquired von Willebrand disease is a rare bleeding disorder that might be caused by other medical problems or medicines. It prevents blood from clotting properly. It is rarer than the inherited form of von Willebrand disease. Medical problems that might cause acquired von Willebrand disease include: Lymph disorders…

Thrombocytopenia

What is thrombocytopenia? Thrombocytopenia (say “throm-buh-sy-tuh-PEE-nee-uh”) is a low number of platelets in the blood. Platelets are the cells that help blood clot. If you don’t have enough of them, your blood can’t clot well. That means it’s harder to stop bleeding. What causes thrombocytopenia? You may have low…

Polycythemia Vera

Polycythemia vera is an abnormal increase in blood cells, primarily red blood cells (polycythemia) but also white blood cells and platelets. As numbers of blood cells rise, the blood becomes thicker. This increases the risk for dangerous blood clots (thrombosis). The cause of polycythemia vera is a mutation in the blood…