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| '''Platelets''', or '''thrombocytes''', are ]-like structures that stick together to form ] ]s. They join together when exposed to the ], as in a cut or disturbance of a ]. Platelets are not cells in the conventional sense, but are fragmented pieces of ] ] released from the ] into the bloodstream. | '''Platelets''', or '''thrombocytes''', are ]-like structures that stick together to form ] ]s. They join together when exposed to the ], as in a cut or disturbance of a ]. Platelets are not cells in the conventional sense, but are fragmented pieces of ] ] released from the ] into the bloodstream. | ||
| Platelets can be separated from donated blood by using a ]. This is necessary because platelets do not survive the normal storage used for ]s, so they must be stored separately. People who need additional clotting agents can benefit from such donations. A (see-through) bag of platelets is pale ]. | Platelets can be separated from donated blood by using a ]. This is necessary because platelets do not survive the normal storage used for ]s, so they must be stored separately. People who need additional clotting agents can benefit from such donations. A (see-through) bag of platelets is pale ]. | ||
| A normal platelet count in a healthy person is between 150 and 400 (x 10<sup>9</sup>/] of blood). People can live independently with a count as low as 20. People can live in hospital with a count as low as 5, but spontaneous bleeding gets to be a problem. Platelets can be ] if a patient's platelet count falls too low. A low platelet count is called '''thrombocytopenia''', having too many platelets is called '''thrombocytosis'''. | A normal platelet count in a healthy person is between 150 and 400 (x 10<sup>9</sup>/] of blood). People can live independently with a count as low as 20. People can live in hospital with a count as low as 5, but spontaneous bleeding gets to be a problem. Platelets can be ] if a patient's platelet count falls too low. A low platelet count is called '''thrombocytopenia''', having too many platelets is called '''thrombocytosis'''. | ||
Revision as of 04:40, 3 April 2004
Platelets, or thrombocytes, are cell-like structures that stick together to form blood clots. They join together when exposed to the air, as in a cut or disturbance of a blood vessel. Platelets are not cells in the conventional sense, but are fragmented pieces of megakaryocyte cytoplasm released from the bone marrow into the bloodstream.
Platelets can be separated from donated blood by using a centrifuge. This is necessary because platelets do not survive the normal storage used for red blood cells, so they must be stored separately. People who need additional clotting agents can benefit from such donations. A (see-through) bag of platelets is pale orange.
A normal platelet count in a healthy person is between 150 and 400 (x 10/L of blood). People can live independently with a count as low as 20. People can live in hospital with a count as low as 5, but spontaneous bleeding gets to be a problem. Platelets can be transfused if a patient's platelet count falls too low. A low platelet count is called thrombocytopenia, having too many platelets is called thrombocytosis.
See also: Hemostasis