Q and A: about health and research

Hemolysis is the premature destruction of red blood cells (RBCs) before the end of their normal lifespan of approximately 120 days. As RBCs break down, hemoglobin is released and metabolized, resulting in increased bilirubin production. Hemolysis may occur within the circulation (intravascular hemolysis) or primarily in the spleen and liver (extravascular hemolysis) . Causes of Hemolysis Hemolytic disorders are broadly classified as intrinsic (intracorpuscular) or extrinsic (extracorpuscular) . Intrinsic causes involve defects within the red blood cell itself and include: Hereditary spherocytosis (HS): inherited defects of RBC membrane proteins. Glucose-6-phosphate dehydrogenase (G6PD) deficiency: increased susceptibility to oxidative damage. Sickle cell disease: abnormal hemoglobin (HbS) leading to sickling and premature RBC destruction. Extrinsic causes affect otherwise normal RBCs and include: Autoimmune hemolytic anemia (AIHA): autoantibodies target RBCs for destruction. I...

  The image above illustrates the process of hematopoiesis in the bone marrow, depicting how stem cells differentiate into various types of blood cells including red blood cells, white blood cells, and platelets. It shows the progression from pluripotent stem cells through various stages of differentiation, leading to the mature forms of each cell type, with labels for the main stages of cell differentiation. This provides a clear, educational overview of how blood cells are formed from stem cells in the bone marrow. Red blood cells (RBCs) and white blood cells (WBCs) originate from stem cells in the bone marrow through a complex process known as hematopoiesis. Once they are formed, these cells enter the bloodstream to perform their respective functions throughout the body. The process of how these cells move from the bone marrow into the vascular system involves several steps: Hematopoiesis : This is the process by which stem cells in the bone marrow differentiate into vari...

An elevated number of erythrocytes (red blood cells or RBCs) and hemoglobin in the blood can indicate a condition known as polycythemia , or more specifically, polyglobulia . While this can be a temporary and benign finding, it may also be a sign of a more serious underlying health issue — particularly a bone marrow disorder such as Polycythemia Vera (PV) . In this article, we explore what elevated RBC and hemoglobin levels mean, what can cause them, and how PV fits into the picture. What Is an Elevated RBC Count? Red blood cells (erythrocytes) play a crucial role in transporting oxygen from the lungs to the body’s tissues. Hemoglobin , the iron-containing protein in RBCs, is responsible for binding to and carrying oxygen. Normal RBC Count In a healthy person, the RBC count typically falls within a specific range, usually measured in millions of cells per microliter (million/µL) of blood. These ranges vary slightly based on age, sex, and laboratory standards. An RBC count is co...