You may feel a little light-headed or faint when you take a blood test.
This is because you’re giving a blood sample, which can temporarily lower your blood pressure.
It’s normal to feel a little light-headed or faint when you take a blood test. But if you have any of these symptoms, talk to your doctor. They can help you find the right test that won’t affect your health.
What to expect during the test?
A healthcare professional will ask you to change into a gown before the test. They’ll ask you to lie down on the exam table.
They’ll use a lancet (needle) to draw blood from a vein. It’s important that the vein you’re asked to give blood into is free of any visible veins or other blood vessels, or so close to the surface of your skin that you can’t easily feel the area.
You may feel a small pinch or slight sting as the needle is placed in your skin. This is normal.
The blood will be collected in a tube and sent to a laboratory for testing. Depending on what’s needed, the test may take a few minutes, a few hours, or overnight.
What do the test results mean?
A blood test can tell your doctor a lot about your overall health, including how well your body is working. The results of blood tests can help your healthcare provider decide what treatment is best for you.
Certain blood tests can also help them find out the cause of a medical condition.
A normal blood test result may not mean that you have a problem. The test results can vary from one lab to another, and sometimes a single blood test can show a wide variety of results.
But in general, normal results mean that the amount of a substance in your blood is within normal limits.
In some cases, a blood test result may be abnormal. It may be normal if the blood tests are performed at the same time as a physical exam. It may also be abnormal if the test results are repeated at different times or after you’ve received certain treatments.
When the results of your blood tests are abnormal, it may mean that your body isn’t producing enough red blood cells, white blood cells, or platelets. It may also mean that your blood is low in a certain substance.
What does a “positive” result mean?
A “positive” result means that there’s a higher than normal amount of a substance in your blood.
Blood tests are often used to check for a variety of substances.
A positive result means that there’s a higher than normal amount of a substance. That means that the test results are normal.
What does a “negative” result mean?
A negative result means that there’s a lower than normal amount of a substance in your blood.
A negative result doesn’t mean that you have a condition.
But it may mean that you don’t have enough blood cells or that you’ve received certain treatments.
What do abnormal test results mean?
An abnormal test result may mean that you have a medical condition or have received certain treatments.
Abnormal test results may also be due to:
- A problem with the test. It’s possible to have an abnormal test result even if you do not have a medical condition.
- A problem with the way that the test is performed. For example, a “false-positive” result may occur because the blood sample was not taken from the right part of your body.
- An error in how the test is read. For example, a test may read “negative” when it really means “positive.”
- A problem in the lab that analyzed the test results. For example, a test may be sent to a lab that’s not equipped to test the blood sample used in the test.
What are some other examples of blood tests?
Along with checking your blood for a variety of substances, a blood test can help your healthcare provider find out about:
- How well your body is working.
- The cause of certain symptoms.
- Whether you have a disease or condition.
- Whether you’re pregnant.
- Whether you’re taking certain medications.
- Whether you’ve received certain treatments.
What is the purpose of blood testing?
Blood tests are used to check several different substances. Understanding what each substance does can help your doctor find out more about your overall health.
Your healthcare provider may use blood tests to:
- Check your blood to see if you have a disease, such as diabetes.
- Find out if you have an infection.
- Check the effectiveness of a medication.
- Find out how well your body is working.
- Find out how well you’re healing from illness or injury.
What tests are used to check for high cholesterol?
A high cholesterol test is a blood test that can help your doctor find out if you have high levels of cholesterol, or if you have a high risk for high cholesterol.
High cholesterol is a risk factor for heart disease. High cholesterol is also a risk factor for stroke and other types of cardiovascular disease.
High cholesterol can be determined with a blood test. It can also be found by using a risk tool to figure out your personal risk.
Why is a blood test done?
A blood test is a way for your healthcare provider to check several different substances in your blood.
Having high levels of certain substances in your blood can increase your risk for certain health problems. Having a high risk for high cholesterol can also increase your risk for other health problems, such as heart disease.
Your healthcare provider may use a blood test to check your cholesterol levels. They may also use a risk tool to determine your risk for high cholesterol.
How should I prepare for the test?
Tell your doctor about any medications, vitamins, or supplements that you’re taking. Make sure that you tell them about any recent illnesses or injuries.
Tell your healthcare provider about all the medications you’re taking. This includes prescription and over-the-counter medicines, vitamins, and supplements.
You may be asked to fast for 8 hours before the test.
What happens during a blood test?
A blood test is a procedure that requires venipuncture. This means you will need to have a vein punctured in your arm.
A healthcare provider will check your blood and draw a sample of blood. Then they will send the blood sample to a lab for testing.
During the procedure, you may feel:
- A slight bump or stinging sensation. This is a normal part of the process.
- A stinging or pressure that goes away when the needle is removed.
After a blood test:
- You may be able to go home the same day.
- You may need to stay in the hospital for a short time.
If your blood test results are abnormal, talk to your healthcare provider. They can help you determine the cause and appropriate treatment.
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