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However, the use of bleeding time in diagnosis is discouraged by the American Society of Hematology practice guidelines [15] and a normal bleeding time does not exclude a platelet disorder. [16] Bone marrow examination may be performed on patients over the age of 60 and those who do not respond to treatment, or when the diagnosis is in doubt. [12]
Neonatal alloimmune thrombocytopenia (NAITP, NAIT, NATP or NAT) is a disease that affects babies in which the platelet count is decreased because the mother's immune system attacks her fetus' or newborn's platelets. A low platelet count increases the risk of bleeding in the fetus and newborn.
One common definition of thrombocytopenia requiring emergency treatment is a platelet count below 50,000/μL. [5] Thrombocytopenia can be contrasted with the conditions associated with an abnormally high level of platelets in the blood – thrombocythemia (when the cause is unknown), and thrombocytosis (when the cause is known). [6] [7]
Thrombotic thrombocytopenic purpura (TTP) is a blood disorder that results in blood clots forming in small blood vessels throughout the body. [2] This results in a low platelet count, low red blood cells due to their breakdown, and often kidney, heart, and brain dysfunction. [1]
CAMT is diagnosed by a bone marrow biopsy and is often initially suspected to be fetal and neonatal alloimmune thrombocytopenia. [3] Two types of Congenital amegakaryocytic thrombocytopenia have been identified with type I being more severe. [1] Treatment is mostly supportive, consisting of multiple platelet transfusions.
These alloantibodies destroy the patient's platelets leading to thrombocytopenia, a rapid decline in platelet count. [1] PTP usually presents 5–12 days after transfusion, and is a potentially fatal condition in rare cases. Approximately 85% of cases occur in women. [2]
Thrombocytopenia – a deficiency of platelets; Pancytopenia – when all three types of blood cells; red blood cells, white blood cells, and platelets, are all deficient. This is a life-threatening disorder that is a characteristic of aplastic anemia. [3] There are also two general causes of cytopenia: autoimmune and refractory.
The 4T score for heparin-induced thrombocytopenia [9] [10] Thrombocytopenia 2 points if the fall in platelet count is >50% of the previous value, AND the lowest count (nadir) is 20–100 × 10 9 /liter 1 point if the fall is 30–50% or the nadir is 10–19 × 10 9 /liter No points if the fall is less than 30% or the nadir is <10 × 10 9 /liter ...