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From other websitesContent disclaimerContent on this website is provided for information purposes only. Information about a therapy, service, product or treatment does not in any way endorse or support such therapy, service, product or treatment and is not intended to replace advice from your doctor or other registered health professional. The information and materials contained on this website are not intended to constitute a comprehensive guide concerning all aspects of the therapy, product or treatment described on the website. All users are urged to always seek advice from a registered health care professional for diagnosis and answers to their medical questions and to ascertain whether the particular therapy, service, product or treatment described on the website is suitable in their circumstances. The State of Victoria and the Department of Health shall not bear any liability for reliance by any user on the materials contained on this website. What is a Hematocrit Test?A hematocrit test is a blood test that measures how much of your blood is made up of red blood cells. Red blood cells carry oxygen from your lungs to the rest of your body. The other parts of your blood include white blood cells (to help fight infection), platelets (to help make blood clots to stop bleeding), and a liquid called plasma. Hematocrit levels that are too high or too low can be a sign of a blood disorder, dehydration, or other medical conditions that affect your blood. Other names: HCT, packed cell volume, PCV, Crit;; H and H (Hemoglobin and Hematocrit) What is it used for?A hematocrit test is often part of a complete blood count (CBC). A CBC is a common blood test that measures the different parts of your blood. It is used to check your general health. It may also be used to help diagnose blood disorders, including anemia, a condition in which you don't have enough red blood cells, and polycythemia, an uncommon disorder in which you have too many red blood cells and your blood becomes too thick. Why do I need a hematocrit test?Your health care provider may order a hematocrit test as part of your regular checkup or to monitor your health if you are being treated for cancer or have an ongoing health condition. Your provider may also order this test if you have symptoms of a red blood cell disorder, such as anemia or polycythemia: Symptoms of anemia (too few red blood cells) may include:
Symptoms of polycythemia (too many red blood cells) may include:
What happens during a hematocrit test?A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes. Will I need to do anything to prepare for the test?You don't need any special preparations for a hematocrit test. If your provider has ordered more tests on your blood sample, you may need to fast (not eat or drink) for several hours before the test. Your provider will let you know if there are any special instructions to follow. Are there any risks to the test?There is very little risk to having a hematocrit test or other type of blood test. You may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly. What do the results mean?Your hematocrit test results are reported as a number. That number is the percentage of your blood that's made of red blood cells. For example, if your hematocrit test result is 42, it means that 42% of your blood is red blood cells and the rest is white blood cells, platelets, and blood plasma. A hematocrit level that's lower than normal may be a sign that:
A hematocrit level that's higher than normal may be a sign that:
If your results are not in the normal range, it doesn't always mean that you have a medical condition that needs treatment. Living at high altitudes where there's less oxygen in the air may cause a high hematocrit. That's because your body responds to low oxygen levels by making more red blood cells so that you get the oxygen you need. Pregnancy can cause a low hematocrit. That's because the body has more fluid than normal during pregnancy, which decreases the percentage that's made of red blood cells. To learn what your test results mean, talk with your provider. Learn more about laboratory tests, reference ranges, and understanding results. Is there anything else I need to know about a hematocrit test?Normal hematocrit levels will be different depending on your sex, age, and the altitude where you live. Ask your provider what hematocrit level is normal for you. References
Which of the following identifies how much of the volume of a sample is made up of red blood cells after the sample has been spun in the centrifuge?ch. 48-test 3 study guide. What test measures the size of red blood cells?An MCV blood test measures the average size of your red blood cells. Red blood cells carry oxygen from your lungs to every cell in your body.
What are red blood cells called on a blood test?A red blood cell (RBC) count measures the number of red blood cells, also known as erythrocytes, in your blood. Red blood cells carry oxygen from your lungs to every cell in your body.
Which of the following is the term for red blood cells white blood cells and platelets quizlet?These blood cells (which are also called corpuscles or "formed elements") consist of erythrocytes (red blood cells, RBCs), leukocytes (white blood cells), and thrombocytes (platelets). By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cells about 0.7%.
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