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Definition. Primary immunodeficiency disorders â also called primary immune disorders or primary immunodeficiency â weaken the immune system, allowing infections and other health problems to occur more easily.efinition. Primary immunodeficiency disorders â also called primary immune disorders or primary immunodeficiency â weaken the immune system, allowing infections and other health problems to occur more easily.
Home > The Sidney Kimmel Comprehensive Cancer Center > Centers & Clinics > Bone Marrow Failure Disorders Essential Thrombocytosis Essential thrombocytosis (ET), or primary thrombocythemia, is a rare disorder in which the body produces too many platelets for unknown reasons. This can cause abnormal blood clotting or bleeding. The condition usually affects people in middle age, although it can be seen in younger patients, especially in women less than 40 years old.