how is the age of the red blood cells measured?
150755
Red blood cell (RBC) count. Red blood cells carry oxygen from the lungs to the rest of the body. They also carry carbon dioxide back to the lungs so it can be exhaled. If the RBC count is low (anemia), the body may not be getting the oxygen it needs. If the count is too high (a condition called polycythemia vera), there is a risk that the red blood cells will clump together and block tiny blood vessels (capillaries).
957851
Yes.  Hematocrit represents the percentage of the blood volume that is composed of blood cells.  Mathematically, it is:\n\nHct = RBC x MCV\n\n(Hct = hematocrit, RBC = red blood cell count, MCV = mean corpuscular volume)\n\nIf your blood cells are really small (low MCV), then the hematocrit can be low even if you have the appropriate number of cells.\n\nCommon causes of microcytic anemia are iron deficiency, thalassemia, sideroblastic anemia, and lead poisoning.  In addition, various chronic disease processes can result in a microcytic anemia.
765701
It varies.\n\nSometimes it is A positive,\n\nSometimes it is O positive.\n\nYes, I know it cannot happen, but that is how the test results come back.\n\nOh, and the red blood cells are being eaten by the white blood cells.
811772
Red blood cell: The blood cell that carries oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide). Hemoglobin, aside from being a transport molecule, is a pigment. It gives the cell its red color (and name). \nThe mature red blood cell (RBC) is a non-nucleated biconcave disk. Thanks to this unusual shape and its hemoglobin content, the RBC is superbly suited to the transport of oxygen. \nA red blood cell is sometimes simply referred to as a red cell. It is also called an erythrocyte or, rarely today, a red blood corpuscle.\n\nWhite blood cell: One of the cells the body makes to help fight infections. There are several types of white blood cells (leukocytes). The two most common types are the lymphocytes and neutrophils (also called polymorphonuclear leukocytes, PMNs, or "polys"). \n\nLymphocytes are made in lymphoid tissue in the spleen, lymph nodes, and thymus gland. There are different kinds of lymphocytes. Lymphocytes identify foreign substances from germs (bacteria or viruses) in the body and produce antibodies and cells that specifically target them. It takes from several days to weeks for lymphocytes to recognize and attack a new foreign substance. \n\nNeutrophils are also major players in the body's defense against bacterial infections. Neutrophils are made in the bone marrow and circulate in the bloodstream. Neutrophils move out of the blood vessels into the infected tissue to attack the bacteria. The pus in a boil (an abscess) is made up largely of neutrophils. Normally a serious bacterial infection causes the body to produce an increased number of neutrophils, resulting in a higher than normal white blood cell count (WBC). When the WBC is low, there may not be enough neutrophils to defend against bacterial infections. \n\nThe white blood cell count is done by counting the number of white blood cells in a sample of blood. A normal WBC is in the range of 4,000 to 11,000 cells per microliter. A low WBC is called leukopenia. A high WBC is termed leukocytosis. \n\nA normal absolute neutrophil count (ANC) is in the range of 1,500 to 8,000 cells per microliter. If the ANC is below 500 for an extended period of time, the risk of serious bacterial infection may increase significantly. A low neutrophil count is called neutropenia.
255261
THE ANSWERS TO THE TWO QUESTIONS ARE DIFFERENT AS UNDER:\nANS 1 ) ANAEMIA.\n        ANAEMIA IS DEFINED AS THE DECREASE IN HEMOGLOBIN LEVEL THAN NORMAL FOR THAT INDIVIDUAL IN CONSIDERATION TO HIS SEX, AGE, ALTITUDE OF RESIDENCE.\nTHE NORMAL LEVEL IN MALES IS 14 -16 GM%\n                 IN FEMALES IS 11 - 14 GM %\nANS 2 ) POLYCYTHEMIA \n        POLYCYTHEMIA IS THE DISORDER IN WHICH THERE IS INCREASED RED BLOOD CELL COUNT AS REGARDS TO THE NORMAL RANGE FOR THAT INDIVIDUALS AGE, SEX AND ALTITUDE OF RESIDENCE.\nTHE NORMAL LEVELS IN MALES IS 4.5 - 6\n                  IN FEMALES IS 3.5 - 5 \n N.B. : LEUKEMIA IS A NEOPLASTIC DISORDER IN WHICH THERE IS INCREASED RBC COUNT
482673
The red blood cell (RBC) count determines the total number of red cells (erythrocytes) in a sample of blood. Examination of the erythrocytes provides the doctor/physician with information concerning anemia-related problems and the bone marrow response (which is where RBC's are produced). \nAnemia is basically deficiency of blood in common language.\n\nWhite blood cells (WBC's) are part of the body's defense or immune system.The WBC count provides clues about certain illnesses, and helps physicians monitor a patient's recovery from others.\nBasically WBC count says all about our immunity.The elevation or decrease in WBC decides our disease-eg leukemia.For a layman, yes WBC says about immunity.\nYou want me to give more details??
268329
White blood cell count (WBC). The number of white blood cells in a volume of blood. Normal range varies slightly between 4,300 and 10,800 cells per cubic millimeter (cmm). This can also be referred to as the leukocyte count and can be expressed in international units as 4.3 - 10.8 x 109 cells per liter. Leukopenia is present when the count falls less than 1000/mm3, the risk of infection increases drastically. LEUKOPENIA IS NEVER NORMAL, can be caused by radiation, anaphylactic shock, systemic lupus erythematosus, and certain chemotherapeutic agents.
1002661
Serological test in this case means "in the serum".  The cells in blood are spun out and the test are made on the fluid that remains.\nBlood count means to count the number of cells seen.  Red blood cells, white blood cells and platelets are counted.
445725
DEVIL is partially correct.  Red blood cells are used to transport oxygen.  They also carry carbon dioxide.  Red blood cells are like little delivery vehicles.  They pick up and deliver oxygen to where it's needed and return carbon dioxide to the lungs to be exhaled.
988075
300-450 white cell is a normal reading even if you get your blood done. Your body replaces the missing ones in a matter of hours. Our body is capable of amazing feats.
335803
Mature human RBC have no nucleus.\n\nMuscle cells have several, as a result of cells fusing together.
52258
This answer is going to have to make many assumptions. For starters, I can't find a source for the weight of a cell, so I will have to base that assumption on the fact that an average size of blood cell is 70 micrometers. Given that and assuming that they have a density if 1g/cm^3, then...\n\n70 micrometers = .007 cm\nVolume of a .007cm sphere = 1.43676E-6 cm^3 = 1.43676E-6 grams\n\nNow we are getting somewhere. Next issue is what is the average molecular weight of the atoms in a blood cell. Basically, the cells have:\nHydrogen (1)\nCarbon (12)\nNitrogen (14)\nOxygen (16)\n\nIn addition to iron, and other metals, but we will discount those as tract amounts.\n\nNow, without knowing more details besides the fact that hydrogen is likely the most common, I will assume an average atomic weight of 8.\n\nSo where were we?\n\nIf 1 mole of atoms weighs 8 grams, than 1.43676E-6 grams would have 1.7959E-7 moles. With one mole eqaul to 6.02E23 aroms....\n\nRoughly 110 Quadrillion atoms.\n\nPS: a Quadrillion is 1000 trillion.
238734
blood cells have a life span of 100 - 120 days. Red cells that are transfused have been stored for up to 35 days in the blood bank. The blood donated will have been a mixture of cells between 0 and 120 days. Regarding replacement of your own blood then it depends how much blood you have lost. If you have been transfused to a decent level of Haemoglobin, then your bone marrow will replace your red cells as normal and whole bodies red cells will have been replaced within 120 days.
895786
4000 to 11000 is the normal range or count of a human being's white blood cells in a cubic centimeter of blood. Below 4000 is probably bone marrow defect and more than 11000 is probably infection or leukaemia
134260
Without a nucleus there is more room for haemoglobin and therefore a greater oxygen-carrying capacity.\nThe consequence is that red blood cells have a short life span; they are constantly being broken down and the parts recycled (except the haem bit which is got rid of into the gut).\nSince the red blood cells have a short life span they must continually be replaced. You can see the importance of a good supply of iron in our diet.\nYou might like to ponder over the diet of new-born mammals - there is no iron in milk.
875930
RBCs are unable to synthesize new proteins to grow or divide. They become old as they lose their flexibility and become increasingly rigid and fragile and their contained hemoglobin begins to degenerate. RBCs have a lifespan of 100-120 days and after they become trapped and fragmented into smaller circulatory channels particularly of those in the spleen. Dying erythrocytes or RBCs are engulfed and destroyed by macrophages of the spleen liver and bone marrow. The heme of their hemoglobin is split off from the globin. Its core of iron is salvaged, bound to protein as ferritin or hemosiderin and stored fro reuse. The balance of the heme group is degraded to bilirubin , a yellow pigment that is released to the blood and binds to albumin for transport.
653016
ESR (erythrocyte sedimentation rate) is a nonspecific screening test for various diseases. This 1-hour test measures the distance (in millimeters) that red blood cells settle in unclotted blood toward the bottom of a specially marked test tube.