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Blood tests have a wide range of uses and are one of the most common types of medical test.
For example, a blood test can be used to:
Most blood tests only take a few minutes to complete and are carried out at your GP surgery or local hospital by a doctor, nurse or phlebotomist (a specialist in taking blood samples).
The healthcare professional who arranges your blood test will tell you whether there are any specific instructions you need to follow before your test.
For example, depending on the type of blood test, you may be asked to:
It’s important to follow the instructions you’re given, as it may affect the result of the test and mean it needs to be delayed or carried out again.