Blood Tests
A blood test is when a sample of blood is taken for testing in a laboratory. 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
- confirm the presence of a bacterial or viral infection
- see how well certain organs, such as the liver and kidneys, are functioning
A blood test usually involves the phlebotomist taking a blood sample from a blood vessel in your arm. and the usual place for a sample is the inside of the elbow or wrist, where the veins are relatively close to the surface. Blood samples from children are most commonly taken from the back of the hand. If requested the child's hand will be anaesthetised (numbed) with a special cream before the sample is taken.
Fasting Blood Test
This means you are not to have any food or drink (except water) for 15 hours before the blood tests.
Please drink about a pint of water before you come for your appointment
Take your tablets as normal except those that you need to take with food.
Glucose Tolerance Blood tests
Your glucose blood test is slightly raised and you will need a further test.
In order to do this effectively you will need to:
- Starve for 15 hours prior to the test
- You can drink water only
- The blood test will be taken in the surgery
- You will be given a “sweet” orange liquid to drink. This drink is called Polycal. If you are NOT exempt from prescription charges (£7.65) this item can be purchased from Severnbank Dispensary for £2.74. It can also be purchased from any pharmacy over the counter.
- You can then go home, but you will need to carry on fasting
- You will also need to rest during this time as activity can have an effect on the blood glucose level
- Return to the surgery 2 hours later for a 2nd blood test
You can find out more about blood tests, their purpose and the way they are performed on the NHS Choices website.