Leukostasis, also known as symptomatic hyperleukocytosis, is a deadly form of leukocytosis (an excess of white blood cells in the blood) defined by greater than 100,000 white blood cells per microliter.
Leukostasis, also known as symptomatic hyperleukocytosis, is a life-threatening complication of various leukemias characterized by an excess of white blood cells in the bloodstream. Hyperleukocytosis is arbitrarily defined as greater than 100,000 white blood cells per microliter.