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Polycythemia is defined as serum hematocrit (Hct) or hemoglobin (HgB) exceeding normal ranges expected for age and sex, typically Hct >49% in healthy adult men and >48% in women, or HgB >16.5 g/dL in men or >16.0 g/dL in women. [8] The definition is different for neonates and varies by age in children. [9] [10]
One study found the median age at diagnosis to be 60 years, [9] while a Mayo Clinic study in Olmsted County, Minnesota found that the highest incidence was in people aged 70–79 years. [40] The overall incidence in the Minnesota population was 1.9 per 100,000 person-years, and the disease was more common in men than women. [ 40 ]
Sickle cell disease is a group of inherited blood disorders, caused by a genetic abnormality in the oxygen-carrying protein haemoglobin found in red blood cells. [57] Under certain circumstances, this leads to the red blood cells adopting an abnormal sickle -like shape; with this shape, they are unable to deform as they pass through capillaries ...
Other blood group incompatibility (RhC, Rhe, Kid, Duffy, MN, P and others) Drug induced immune mediated hemolytic anemia Penicillin (high dose) Methyldopa; Hemoglobinopathies (where these is an unstable or crystalline hemoglobin) Paroxysmal nocturnal hemoglobinuria (rare acquired clonal disorder of red blood cell surface proteins)
Telangiectasia-erythrocytosis-monoclonal gammopathy-perinephric-fluid collections-intrapulmonary shunting syndrome TEMPI syndrome is an orphan disease where the patients share five characteristics from which the acronym is derived: telangiectasias , elevated erythropoietin and erythrocytosis , monoclonal gammopathy , perinephric fluid ...
Methemoglobinemia mostly affects infants under 6 months of age (particularly those under 4 months) due to low hepatic production of methemoglobin reductase. [ 23 ] [ 24 ] The most at-risk populations are those with water sources high in nitrates , such as wells and other water that is not monitored or treated by a water treatment facility.
The term human blood group systems is defined by the International Society of Blood Transfusion (ISBT) as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them", [1] and include the common ABO and Rh ...
Southeast Asian ovalocytosis and spherocytic elliptocytosis are less common subtypes predominantly affecting those of south-east Asian and European ethnic groups, respectively. The following categorisation of the disorder demonstrates its heterogeneity: [9] Common hereditary elliptocytosis (in approximate order from least severe to most severe)