When muscle or heart cells are injured, troponin leaks out, and its levels in your blood rise. For example, blood levels of troponin rise when you have a heart attack. For this reason, doctors often order troponin tests when patients have chest pain or other heart attack signs and symptoms. A blood product called CK-MB is released when the heart muscle is damaged.
High levels of CK-MB in the blood can mean that you've had a heart attack. A lipoprotein panel is a blood test that can help show whether you're at risk for coronary heart disease CHD. This test looks at substances in your blood that carry cholesterol.
Abnormal cholesterol and triglyceride levels may be signs of increased risk for CHD. Blood clotting tests sometimes are called a coagulation KO-ag-yu-LA-shun panel. These tests check proteins in your blood that affect the blood clotting process.
Abnormal test results might suggest that you're at risk of bleeding or developing clots in your blood vessels. Your doctor may recommend these tests if he or she thinks you have a disorder or disease related to blood clotting.
Blood clotting tests also are used to monitor people who are taking medicines to lower the risk of blood clots. Warfarin and heparin are two examples of such medicines.
Other blood tests require fasting not eating any food for 8 to 12 hours before the test. Your doctor will tell you how to prepare for your blood test s. Blood usually is drawn from a vein in your arm or other part of your body using a needle. It also can be drawn using a finger prick. The person who draws your blood might tie a band around the upper part of your arm or ask you to make a fist.
Doing this can make the veins in your arm stick out more, which makes it easier to insert the needle. The needle that goes into your vein is attached to a small test tube. The person who draws your blood removes the tube when it's full, and the tube seals on its own.
The needle is then removed from your vein. If you're getting a few blood tests, more than one test tube may be attached to the needle before it's withdrawn. Some people get nervous about blood tests because they're afraid of needles. Others may not want to see blood leaving their bodies. If you're nervous or scared, it can help to look away or talk to someone to distract yourself. You might feel a slight sting when the needle goes in or comes out. Once the needle is withdrawn, you'll be asked to apply gentle pressure with a piece of gauze or bandage to the place where the needle was inserted.
This helps stop bleeding. It also helps prevent swelling and bruising. Most of the time, you can remove the pressure after a minute or two. You may want to keep a bandage on for a few hours. Usually, you don't need to do anything else after a blood test. Results can take anywhere from a few minutes to a few weeks to come back. Your doctor should get the results. It's important that you follow up with your doctor to discuss your test results.
The main risks of blood tests are discomfort and bruising at the site where the needle goes in. These complications usually are minor and go away shortly after the tests are done. Blood tests show whether the levels of different substances in your blood fall within a normal range.
For many blood substances, the normal range is the range of levels seen in 95 percent of healthy people in a certain group. Blood tests to check for heart disease. These include cholesterol tests and a triglyceride test. Blood clotting tests , also known as a coagulation panel. These tests can show if you have a disorder that causes too much bleeding or too much clotting. What happens during a blood test? Venipuncture is the most common way to do a blood test.
Other ways to do a blood test are: A finger prick test. This test is done by pricking your fingertip to obtain a small amount of blood. Finger prick testing is often used for at-home test kits and rapid tests. Rapid tests are easy to use tests that provide very fast results and require little or no special equipment.
A heel stick test. This is most often done on newborns. During a heel stick test, a health care provider will clean your baby's heel with alcohol and poke the heel with a small needle.
The provider will collect a few drops of blood and put a bandage on the site. Arterial blood test. This test is done to measure oxygen levels. Blood from arteries has higher levels of oxygen than blood from a vein. So for this test, blood is taken from an artery instead of a vein. For example, a Lipid Panel is a blood test done to help determine your risk for heart disease.
This test is more accurate if you have fasted for several hours. It will give information about your cholesterol levels and the amount of fat in your blood. Abnormal levels may also be signs of increased risk for stroke or clogged arteries in your neck, arms or legs called peripheral vascular disease.
You may be asked to submit a urine sample during your exam visit. A rapid urine test involves immersing a test strip into the liquid and noting color changes on the strip. Only a small amount of blood is taken during the test so you shouldn't feel any significant after-effects. However, some people feel dizzy and faint during and after the test. If this has happened to you in the past, tell the person carrying out the test so they're aware and can help you feel more comfortable.
After the test, you may have a small bruise where the needle went in. Bruises can be painful, but are usually harmless and fade over the next few days. After the blood sample has been taken, it will be put into a bottle and labelled with your name and details. It will then be sent to a laboratory where it will be examined under a microscope or tested with chemicals, depending on what's being checked.
The results are sent back to the hospital or to your GP. Some test results will be ready the same day or a few days later, although others may not be available for a few weeks. You'll be told when your results will be ready and how you'll be given them.
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