Polycythemia (otherwise called polycythaemia or polyglobulia) is a sickness state in which the hematocrit (the volume level of red platelets in the blood) is elevated. It can be because of an expansion in the quantity of red platelets ("outright polycythemia") or to a diminishing in the volume of plasma ("relative polycythemia"). Polycythemia is at times called erythrocytosis, yet the terms are not synonymous, in light of the fact that polycythemia alludes to any expansion in red platelets, while erythrocytosis just alludes to an archived increment of red cell mass. The crisis treatment of polycythemia (e.g., in hyperviscosity or thrombosis) is by phlebotomy (expulsion of blood from the dissemination). Contingent upon the basic reason, phlebotomy may likewise be utilized all the time to decrease the hematocrit. Cytostatics, for example, busulfan and hydroxyurea are in some cases utilized for long haul administration of polycythemia.
The overproduction of red platelets might be because of an essential procedure in the bone marrow (a purported myeloproliferative disorder), or it might be a response to incessantly low oxygen levels or, once in a while, a danger. Then again, extra red platelets may have been received through another procedure—for instance, being over-transfused (either accidentally or, as blood doping, intentionally) or being the beneficiary twin in a pregnancy, experiencing twin-to-twin transfusion disorder.
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