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| | Ask the Doctor, with Dawn Richardson: Hydration and hematocrit |
 | | Altitude tents are, of course, used by many athletes to raise their hematocrit levels "naturally," although the use of such a hypobaric chamber is not consider a valid reason for the UCI to grant a medical dispensation. | | | There are athletes who have a high hematocrit waiver from the UCI because they naturally and consistently run above 50 percent. | | | Incidentally, I seem to recall that Marco Pantani used dehydration as an explanation for failing a hematocrit test in the Giro in 1999. |
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http://www.velonews.com/train/articles/5300.0.html
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| | BLOOD TESTING FOR PROFESSIONAL CYCLISTS |
| | As part of the normal venous blood analysis, hematocrit is determined using routine laboratory equipment (a Coulter Counter). | | | Or perhaps there is evidence indicating that a 51% hematocrit is dangerous for endurance athletes. | | | While elite athletes wait for sensitive rhEPO detection techniques to emerge, measurements of hematocrit may represent a temporary deterrent. |
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http://www.sportsci.org/news/news9703/AISblood.html
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| | Hemoglobin, Hematocrit, EPO, and Senility |
| | A hematocrit of ~54 or greater is associated with an increased incidence of DVT, or clots in the deep veins of the leg, because the blood becomes more viscous as hematocrit increases and flows more slowly. | | | It is only conjecture on my part that hematocrit is perhaps the principle cause of senile dementia, but it is such a logical assumption that it is worth making a study to find out if there is a relation. | | | the startoff point of an athlete is not 40% hematocrit, it is closer to 50%... |
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http://www.rajeun.net/hb.html
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| | MedFriendly.com: Hematocrit |
| | Hematocrit (abbreviated Hct) has the following meanings in the field of medicine: | | | What is an example of what hematocrit would mean? | | | People in the medical field often refer to hematocrit as crit. |
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http://www.medfriendly.com/hematocrit.html
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| | Hematocrit AHealthyMe.com |
| | The level differs for each person, depending on his or her clinical condition. | | | The hematocrit is usually done on a person with symptoms of anemia. | | | Additional tests, and the person's symptoms and medical history help distinguish these conditions or diagnose a specific type of anemia. |
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http://www.ahealthyme.com/topic/topic100586919
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| | Hematocrit (HCT) or Packed Cell Volume (PCV)- The Doctors Lounge(TM) |
| | The hematocrit may be changed by altitude, position, and heavy smoking, in the same manner as the hemoglobin may be changed. | | | Hematocrit depends mostly on the number of RBCs but there is some effect (to a much lower extent) from the average size of the RBCs. | | | The hematocrit is usually about 3 times the hemoglobin value (assuming there is not marked hypochromia). |
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http://www.thedoctorslounge.net/hematology/labs/hematocrit.htm
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| | Hematocrit: The Test Sample |
| | A sample is obtained by drawing blood through a needle placed in a vein in the arm or by a fingerstick (for children and adults) or a heelstick (for newborns). | | | For example, a hematocrit value of 40% means that there are 40 milliliters of red blood cells in 100 milliliters of blood. | | | The hematocrit rises when the number of red blood cells increases or when the plasma volume is reduced, as in dehydration. |
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http://www.labtestsonline.org/understanding/analytes/hematocrit/sample.html
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| | Hematocrit - Health and Medical Information produced by doctors - MedicineNet.com |
| | Hematocrit - Health and Medical Information produced by doctors - MedicineNet.com | | | Some other infrequent causes of elevated hematocrit are lung disease, certain tumors, a disorder of the bone marrow known as polycythemia rubra vera, and abuse of the drug erythropoietin (Epogen) by athletes for blood doping purposes. | | | The hematocrit can also be determined by a manual method using a centrifuge. |
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http://www.medicinenet.com/hematocrit/article.htm
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| | Hematocrit |
| | Laurence Corash, "Laboratory Hematology: Methods for the Analysis of Blood", in Blood: Principles and Practice of Hematology, eds. | | | A high hematocrit (e.g., 70%) produces problems as well, but is uncommon. | | | In this example, the hematocrit is about 40%. |
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http://sickle.bwh.harvard.edu/hct.html
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| | Wednesday's mailbag: Hematocrit levels, Mexican odyssey, bumper stickers, the Bosox boogie and Zabriskie |
| | All the research I have done seems to indicate a "normal" hematocrit range of around 45-62 percent. | | | I fail to understand why the UCI and other governing bodies chose an arbitrary hematocrit of 50 percent as the cutoff for male cyclists. | | | In one particular study by Vásquez and Villena, 2001 (see Normal Hematological Values for Healthy Persons Living at 4000 Meters in Bolivia), they found male hematocrit averaged 52.7 percent with a range of "normal" values from 45 percent to 61 percent. |
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http://www.velonews.com/news/fea/7135.0.html
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| | MedTech1.com - Hematocrit |
| | It might be used to obtain information about medical conditions, or to determine suitability for or the success of a blood transfusion. | | | For example, if 30 percent of the blood contains red cells and 70 percent does not, the hematocrit will be 30. | | | Lung disease and certain bone disorders also increase red blood cell count. |
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http://www.medtech1.com/research_center/diag20.cfm?diag_id=197
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| | Hematocrit (HCT) |
| | When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. | | | The hematocrit is the percent of whole blood that is composed of red blood cells. | | | The hematocrit is almost always ordered as part of a complete blood count, which measures the number of red blood cells, the number of white blood cells, the total amount of hemoglobin in the blood, and the fraction of the blood composed of red blood cells (hematocrit). |
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http://www.umm.edu/ency/article/003646.htm
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| | Hematocrit: The Test |
| | For more information on reference ranges, please read Reference Ranges and What They Mean. | | | However, it may reflect a condition called polycythemia vera—that is, when a person has more than the normal number of red blood cells. | | | Decreased hematocrit indicates anemia, such as that caused by iron deficiency or other deficiencies. |
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http://www.labtestsonline.org/understanding/analytes/hematocrit/test.html
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| | Hematocrit - Wikipedia, the free encyclopedia |
| | This increase is mediated by the increased levels of erythropoyetin by the kidneys in response to hypoxia. | | | Chronic obstructive pulmonary disease (and other pulmonary conditions associate with hypoxia) may elicit an increased production of red blood cells. | | | The boogers is not usually considered an important consideration when looking at a person's full blood count results as most people are more concerned with the hemoglobin concentration and mean cell volume. |
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http://en.wikipedia.org/wiki/Hematocrit
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| | Hematocrit - Complete Blood Count |
| | Expect a patient's hematocrit to drop immediately after major hemorrhage. | | | A major reason for anemia in patients with renal failure is lack of erythropoetin to stimulate bone marrow production. | | | How a patient responds to a low hematocrit depends on whether the blood loss is acute or chronic. |
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http://www.rnceus.com/cbc/cbchct.html
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| | Hematocrit |
| | Blood loss and cancer are some of the disease states that can lower HCT, but training can also have an effect. | | | This is why the UCI will remove a rider from competition for "health reasons" if he or she has a hematocrit above 50%. | | | Research indicates that training at altitude has no effects on sea level performance, and it may actually be a detriment. |
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http://www.cyclingscience.org/hematocrit.htm
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| | Procedure Hematocrit |
| | Hematocrits that are greater than 56% may affect coagulation results. | | | The following substances can adversely affect the results: |
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http://health.ucsd.edu/labref/P10.html
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| | Blood Hematocrit and Hemoglobin |
| | Decreased hematocrit or hemoglobin may indicate anemia, such as that caused by iron deficiency. | | | Further testing may be necessary to determine the exact cause of the anemia. | | | The hematocrit is a measure of the fractional level of red cells in the blood. |
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http://tlhs.tufts.edu/assessment_day/results/iron.html
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| | Tests & Examinations: Hematocrit & Hemoglobin |
| | For example, 40 percent means that there are 40 milliliters of packed red blood cells in a 100 milliliter sample. | | | Together, the hematocrit and hemoglobin tests help diagnose anemia and polycythemia. | | | Hematocrit measures the percentage of total blood volume that is red blood cells. |
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http://www.baptistonline.org/health/library/test3237.asp
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| | hematocrit - definition of hematocrit by the Free Online Dictionary, Thesaurus and Encyclopedia. |
| | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | hematocrit - a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood | | | A centrifuge used to determine the volume of blood cells and plasma in a given sample of blood. |
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http://www.thefreedictionary.com/hematocrit
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| | Page 2 - Cunego's naturally elevated hematocrit |
| | Steroidal hormones can increase the total blood volume, which is independent of hematocrit (rbc concentration), although the overall effect may be similar (more rbcs = more O2). | | | So now I'll have to ask you for references as well. | | | Take a look here, this was a huge story in British cycling. |
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http://www.cyclingforums.com/showthread.php?p=951053
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| | HEMATOCRIT, ABG |
| | For routine hematocrit tests, order Hematocrit only (Hematology test) and send or deliver to Sample Managment, room 5.136 McCullough Building. | | | Indicate on slip and announce to lab personnel if sample is a CODE; sample will receive priority analysis. |
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http://www.utmb.edu/lsg/LabSurvivalGuide/chem/hematocrit_ABG.htm
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