Cathy Parkes, RN, reviews polycythemia and coagulation disorders, covering their causes, symptoms, lab findings, and treatments. Polycythemia is a rare blood disorder involving increased red blood cell production, either from a gene mutation (primary) or chronic low oxygen levels (secondary), with treatment including phlebotomy and medications like hydroxyurea. Coagulation disorders, including hemophilia, ITP, HIT, and DIC, are explored through their unique lab patterns and therapeutic approaches. Parkes emphasizes appropriate nursing care and patient education, and concludes with a quiz to reinforce key concepts.