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:
- assess your general state of health
- check if you have an infection
- see how well certain organs, such as the liver and kidneys, are working
- screen for certain genetic conditions
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).
How to prepare for a blood test?
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:
- avoid eating or drinking anything (fasting) apart from water, for up to 12 hours
- stop taking certain medicines
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.
