The Vital Role of Immunohematology in Diagnosing Paroxysmal Cold Hemoglobinuria: A Clinical Case Report.

Paroxysmal cold hemoglobinuria (PCH) is a rare autoimmune hemolytic anemia caused by the binding of IgG immunoglobulins to red blood cells at cold temperatures, leading to hemolysis upon rewarming. The Donath-Landsteiner test can show biphasic hemolysis, leading to diagnosis. There is no consensus, but chemoimmunotherapy with or without plasma exchange is commonly employed. We present the case of a 42-year-old male who experienced symptoms of hemolysis after cold exposure in a semi-arid, warm-climate city.