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Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Autoimmune Hemolytic Anemia

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In one line

·The immune system mistakes the patient's own red blood cells for foreign invaders and destroys them faster than the bone marrow can replace them.

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Normal physiology

·Red blood cells (erythrocytes) are made in the bone marrow and live about 120 days in the bloodstream, carrying oxygen from the lungs to all body tissues. The immune system normally recognizes self-antigens (protein markers on your own cells) and does not attack them. Old or damaged red cells are gently removed by the spleen and liver, and the iron from hemoglobin (the oxygen-carrying protein inside red cells) is recycled to make new cells.

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What goes wrong

·In autoimmune destroying red blood cells (hemolytic) anemia, the immune system loses its ability to recognize red blood cells as 'self' and starts making antibodies against them. These antibodies attach to the red cell surface like sticky tags, marking them for destruction. The spleen and liver then destroy these tagged red cells much faster than normal—sometimes within hours instead of months—causing severe anemia because the bone marrow cannot keep up with the rapid loss.

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Hallmark signs

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Red flags · escalate now

·Hemoglobin below 7 g/dL with chest pain, confusion, or severe shortness of breath at rest requiring immediate transfusion
·New swollen lymph nodes (lymphadenopathy) or an enlarged spleen (splenomegaly) suggesting underlying lymphoma or chronic lymphocytic leukemia driving the red blood cell destruction (hemolysis)
·Drug-induced destroying red blood cells (hemolytic) anemia with continued exposure to the causative medication
·Cold agglutinin disease with distal starved blood flow (ischemia) (blue fingers or toes) from red blood cell agglutination blocking small vessels

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Workup

·Complete blood count with differential and reticulocyte count
·Direct antiglobulin test (DAT or Coombs test)
·Indirect bilirubin and lactate dehydrogenase (LDH)
·Haptoglobin
·Peripheral blood smear
·Cold agglutinin titer
·Flow cytometry for paroxysmal nocturnal hemoglobinuria (PNH) and lymphoproliferative disorders
·Serum protein electrophoresis and immunofixation

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Treatment

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NCLEX trap

·Transfusions are reserved for severe symptomatic anemia or hemoglobin below 7 g/dL because donor red blood cells can also be destroyed by the same antibodies, and crossmatching is difficult.
·AIHA is not an infection but an autoimmune disorder where the body attacks its own red blood cells, so treatment focuses on immunosuppression with corticosteroids, not antibiotics.
·Yellowing of the skin and eyes (Jaundice) in AIHA is from indirect (unconjugated) hyperbilirubinemia due to red blood cell breakdown, not liver dysfunction, so liver enzymes (AST, ALT) are typically normal.
·In destroying red blood cells (hemolytic) anemia the bone marrow responds by making more young red blood cells, so reticulocyte count is high (greater than 2 percent), unlike in aplastic anemia where the marrow fails.
·Cold exposure triggers red blood cell destruction (hemolysis) in cold agglutinin disease, so patients must avoid cold temperatures, keep extremities warm, and never apply ice or cold compresses.
·Corticosteroids are first-line therapy; splenectomy is reserved for patients who fail steroids and second-line agents because the spleen is a major site of red blood cell destruction.

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