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Practo

Diagnostic Tests

Cd 55 Immunohistochemistry Bone Marrow

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Cd 55 Immunohistochemistry Bone Marrow

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What is this test?

The regulatory proteins CD55 and CD59 are glycolsylphosphatidylinositol-anchored, type I cell surface proteins, which inhibit formation of the C3 convertases and prevent the terminal polymerization of the membrane attack complexes, respectively. Paroxysmal nocturnal hemoglobinuria (PNH) is a genetic disorder due to the impaired conformation of the glycolsylphosphatidylinositol anchor, which results in the deficient expression of CD55 and CD59 leading to excessive destruction of red cells and leukocytes. Paroxysmal nocturnal hemoglobinuria (PNH) is an acquired hematologic disorder characterized by nocturnal hemoglobinuria, chronic hemolytic anemia, thrombosis, pancytopenia, and, in some patients, acute or chronic myeloid malignancies. PNH appears to be a hematopoietic stem cell disorder that affects erythroid, granulocytic, and megakaryocytic cell lines. The abnormal cells in PNH have been shown to lack glycosylphosphatidylinositol (GPI)-linked proteins in erythroid, granulocytic, megakaryocytic, and, in some instances, lymphoid cells. Mutations in the phosphatidylinositol glycan A gene, PIGA, have been identified consistently in patients with PNH, thus confirming the biological defect in this disorder. A flow cytometric-based assay can detect the presence or absence of these GPI-linked proteins in granulocytes, monocytes, erythrocytes, and lymphocytes, thus avoiding the problems associated with red cell-based diagnostic methods (Ham test) in which recent hemolytic episodes or recent transfusions can give false-negative results. A partial list of known GPI-linked proteins include CD14, CD16, CD24, CD55, CD56, CD58, CD59, C8-binding protein, alkaline phosphatase, acetylcholine esterase, and a variety of high frequency human blood antigens. In addition, fluorescent aerolysin (FLAER) binds directly to the GPI anchor and can be used to evaluate the expression of the GPI linkage.

Also known as IHC Marker CD 55 Immunohistochemistry Bone Marrow, CD 55 Count Immunohistochemistry Bone Marrow.

Test Preparation

No special preparation is needed for Cd 55 Immunohistochemistry Bone Marrow. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing Cd 55 Immunohistochemistry Bone Marrow. Your doctor depending on your condition will give specific instructions.

Understanding your test results

GenderAge groupsValue
UNISEXAll age groupsTest is positive if the conditions listed are detected
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